Update LLVM to llvm/llvm-project@ac8bb735 (#19566)

Update LLVM to llvm/llvm-project@ac8bb735. C++ changes are related to
change in behavior of TypeConverter changed in

iree-org/llvm-project@3cc311a.
It used to generate UnrealizedConversionCastOp, during
applySignatureConversion in GenericOpTypePropagation of
TypePropagationPass.cpp, however now it's not. This causes
unrealized_conversion_cast to be generated later and hence survive the
pass. To repro above behavior, try undo the C++ change in this PR and
then:

```
wget https://gist.githubusercontent.com/raikonenfnu/dfb3b274007df8c4be87daf9ee67a5f4/raw/e48cc07e5fa558cd2c450b0e3ae46568136e1be6/type_propagate_repro.mlir
iree-opt --pass-pipeline='builtin.module(func.func(iree-codegen-type-propagation))' propagate_test.mlir -o /dev/null

error: failed to legalize unresolved materialization from ('i8') to ('i1') that remained live after conversion
  ^bb0(%in: i1, %in_0: f32, %in_1: f32, %out: f32):
       ^
propagate_test.mlir:5:8: note: see current operation: %10 = "builtin.unrealized_conversion_cast"(%arg0) : (i8) -> i1
propagate_test.mlir:6:11: note: see existing live user here: %10 = arith.select %9, %in_0, %in_1 : f32
```

Additionally, we made API changes in
6ed8924 from:
1. `applyPatternsAndFoldGreedily` -> `applyPatternsGreedily`
2. `applyOpPatternsAndFold` -> `applyOpPatternsGreedily`
To resolve depracated API error in bazel 

This PR also carries the following reverts:

llvm/llvm-project#119461

The main issue with PR 119461 is it breaks e2e riscv test by making it
get stuck on infinite loop.
```
/path/to/iree-build/tools/iree-compile --output-format=vm-bytecode --mlir-print-op-on-diagnostic=false --iree-hal-target-backends=llvm-cpu --iree-input-type=stablehlo --iree-input-demote-f64-to-f32 --iree-llvmcpu-target-cpu=generic /path/to/iree/tests/e2e/stablehlo_ops/three_fry.mlir -o three_fly_exec_target.mlir --iree-llvmcpu-target-triple=riscv64 --iree-llvmcpu-target-abi=lp64d --iree-llvmcpu-target-cpu-features=+m,+a,+d,+zvl512b,+v --mlir-disable-threading
> infinite loop
```

---------

Signed-off-by: Stanley Winata <[email protected]>

Author: raikonenfnu

compiler/plugins/input/StableHLO/Conversion/LegalizeCHLO.cpp

@@ -2182,8 +2182,7 @@ struct LegalizeChlo final : impl::LegalizeChloBase<LegalizeChlo> {
       mlir::shape::CstrBroadcastableOp::getCanonicalizationPatterns(patterns,
                                                                     ctx);
       mlir::tensor::CastOp::getCanonicalizationPatterns(patterns, ctx);
-      if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                              std::move(patterns)))) {
+      if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
         return signalPassFailure();
       }
     }

compiler/plugins/input/StableHLO/Conversion/LegalizeShapeComputations.cpp

@@ -170,7 +170,7 @@ struct LegalizeShapeComputations final
 
     auto func = this->getOperation();
     populateLegalizeShapeComputationPatterns(&ctx, &patterns);
-    if (failed(applyPatternsAndFoldGreedily(func, std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(func, std::move(patterns)))) {
       this->signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/Canonicalization.cpp

@@ -1156,8 +1156,7 @@ struct StableHLOCanonicalize final
     MLIRContext *ctx = &getContext();
     RewritePatternSet patterns(ctx);
     populateCanonicalizationPatterns(ctx, &patterns);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/DotGeneralToDot.cpp

@@ -419,8 +419,7 @@ struct DotGeneralToDot final : impl::DotGeneralToDotBase<DotGeneralToDot> {
   void runOnOperation() override {
     RewritePatternSet patterns(&getContext());
     populatePreprocessingDotGeneralToDotPatterns(&getContext(), &patterns);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       return signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/EinsumToDotGeneral.cpp

@@ -160,8 +160,7 @@ struct EinsumToDotGeneral final
   void runOnOperation() override {
     RewritePatternSet patterns(&getContext());
     populatePreprocessingEinsumToDotGeneralPatterns(&getContext(), &patterns);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       return signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/FlattenTuplesInCFG.cpp

@@ -359,8 +359,7 @@ struct FlattenTuplesInCFG final
     patterns.insert<DetupleCallOp, DetupleIndirectCallOp, DetupleConditionOp,
                     DetupleReturnOp, DetupleBranchOp>(ctx);
     populateCanonicalizationPatterns(ctx, &patterns);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       return signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/FlattenTuplesInSCF.cpp

@@ -255,8 +255,7 @@ struct FlattenTuplesInSCF final
     patterns
         .add<DetupleYieldOp, DetupleConditionOp, DetupleIfOp, DetupleWhileOp>(
             ctx);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       return signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/GatherToTorchIndexSelect.cpp

@@ -127,8 +127,7 @@ struct GatherToTorchIndexSelect final
     MLIRContext *ctx = &getContext();
     RewritePatternSet patterns(ctx);
     populatePreprocessingGatherToTorchIndexSelectPatterns(ctx, &patterns);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       return signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/LowerComplex.cpp

@@ -74,8 +74,7 @@ struct LowerComplex final : impl::LowerComplexBase<LowerComplex> {
     RewritePatternSet patterns(ctx);
     populatePreprocessingComplexPatterns(ctx, &patterns);
     populateCanonicalizationPatterns(ctx, &patterns);
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       signalPassFailure();
     }
   }

compiler/plugins/input/StableHLO/Conversion/Preprocessing/StableHLOToStableHLO.cpp

@@ -1968,8 +1968,7 @@ struct StableHLOToStableHLOPreprocessing final
       patterns.insert<ReorderConvOpKernelDimensions>(context);
       patterns.insert<ReorderConvOpOutputDimensions>(context);
     }
-    if (failed(applyPatternsAndFoldGreedily(getOperation(),
-                                            std::move(patterns)))) {
+    if (failed(applyPatternsGreedily(getOperation(), std::move(patterns)))) {
       return signalPassFailure();
     }
   }