[region-isolation] Fix crash due to missing visitVectorBaseAddrInst case

Credit to https://github.com/stzn for initial work on the patch.

rdar://151401230

Author: stzn

lib/SILOptimizer/Analysis/RegionAnalysis.cpp

@@ -141,7 +141,16 @@ struct AddressBaseComputingVisitor
     return SILValue();
   }
 
-  SILValue visitNonAccess(SILValue) { return SILValue(); }
+  SILValue visitNonAccess(SILValue value) {
+    // For now since it is late in 6.2, work around vector base addr not being
+    // treated as a projection.
+    if (auto *v = dyn_cast<VectorBaseAddrInst>(value)) {
+      isProjectedFromAggregate = true;
+      return v->getOperand();
+    }
+
+    return SILValue();
+  }
 
   SILValue visitPhi(SILPhiArgument *phi) {
     llvm_unreachable("Should never hit this");
@@ -312,6 +321,7 @@ static bool isStaticallyLookThroughInst(SILInstruction *inst) {
   case SILInstructionKind::UncheckedEnumDataInst:
   case SILInstructionKind::StructElementAddrInst:
   case SILInstructionKind::TupleElementAddrInst:
+  case SILInstructionKind::VectorBaseAddrInst:
     return true;
   case SILInstructionKind::MoveValueInst:
     // Look through if it isn't from a var decl.

test/Concurrency/regionanalysis_trackable_value.sil

@@ -681,4 +681,45 @@ bb2:
 bb3:
   %9999 = tuple ()
   return %9999 : $()
-}
+}
+
+// CHECK-LABEL: begin running test 1 of 1 on alloc_stack_inline_array_sendable: sil_regionanalysis_underlying_tracked_value with: @trace[0]
+// CHECK: TrackableValue. State: TrackableValueState[id: 0][is_no_alias: no][is_sendable: yes][region_value_kind: disconnected].
+// CHECK:     Rep Value: %2 = vector_base_addr %1
+// CHECK: end running test 1 of 1 on alloc_stack_inline_array_sendable: sil_regionanalysis_underlying_tracked_value with: @trace[0]
+sil [ossa] @alloc_stack_inline_array_sendable : $@convention(thin) () -> () {
+bb0:
+  specify_test "sil_regionanalysis_underlying_tracked_value @trace[0]"
+  %0 = alloc_stack $InlineArray<1, UInt8>
+  %1 = struct_element_addr %0: $*InlineArray<1, UInt8>, #InlineArray._storage
+  %2 = vector_base_addr %1 : $*Builtin.FixedArray<1, UInt8>
+  %3 = integer_literal $Builtin.Int8, 0
+  %4 = struct $UInt8 (%3)
+  store %4 to [trivial] %2
+  %6 = load [trivial] %0
+  dealloc_stack %0
+  debug_value [trace] %2
+
+  %7 = tuple ()
+  return %7 : $()
+}
+
+// CHECK-LABEL: begin running test 1 of 1 on alloc_stack_inline_array_nonsendable: sil_regionanalysis_underlying_tracked_value with: @trace[0]
+// CHECK: TrackableValue. State: TrackableValueState[id: 0][is_no_alias: yes][is_sendable: no][region_value_kind: disconnected].
+// CHECK:     Rep Value: %1 = alloc_stack $InlineArray
+// CHECK: end running test 1 of 1 on alloc_stack_inline_array_nonsendable: sil_regionanalysis_underlying_tracked_value with: @trace[0]
+sil [ossa] @alloc_stack_inline_array_nonsendable : $@convention(thin) (@owned NonSendableKlass) -> () {
+bb0(%arg : @owned $NonSendableKlass):
+  specify_test "sil_regionanalysis_underlying_tracked_value @trace[0]"
+  %0 = alloc_stack $InlineArray<1, NonSendableKlass>
+  %1 = struct_element_addr %0: $*InlineArray<1, NonSendableKlass>, #InlineArray._storage
+  %2 = vector_base_addr %1 : $*Builtin.FixedArray<1, NonSendableKlass>
+  store %arg to [init] %2
+  %6 = load [take] %0
+  destroy_value %6
+  dealloc_stack %0
+  debug_value [trace] %2
+
+  %7 = tuple ()
+  return %7 : $()
+}

test/Concurrency/transfernonsendable_rbi_result.swift

@@ -1,4 +1,4 @@
-// RUN: %target-swift-frontend -target %target-swift-5.1-abi-triple -swift-version 6 -parse-as-library %s -emit-sil -o /dev/null -verify
+// RUN: %target-swift-frontend -target %target-swift-5.1-abi-triple -swift-version 6 -disable-availability-checking -parse-as-library %s -emit-sil -o /dev/null -verify
 
 // REQUIRES: asserts
 // REQUIRES: concurrency
@@ -135,3 +135,8 @@ func testGenericResults() async {
   let _: NonSendable = await mainActorGenericReturnNonSendable()
   // expected-error @-1 {{non-Sendable 'NonSendable'-typed result can not be returned from main actor-isolated global function 'mainActorGenericReturnNonSendable()' to nonisolated context}}
 }
+
+// https://github.com/swiftlang/swift/issues/81534
+func testInlineArray() {
+  let _: InlineArray<_, UInt8> = [0]
+}