fixup! [MLIR][LLVM] Fix #llvm.constant_range crashing in storage uniquer

Author: Jezurko

mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td

@@ -1094,7 +1094,8 @@ def LLVM_TBAATagArrayAttr
 // ConstantRangeAttr
 //===----------------------------------------------------------------------===//
 def LLVM_ConstantRangeAttr : LLVM_Attr<"ConstantRange", "constant_range"> {
-  let parameters = (ins APIntParameter<"">:$lower,
+  let parameters = (ins
+    APIntParameter<"">:$lower,
     APIntParameter<"">:$upper
   );
   let summary = "A range of two integers, corresponding to LLVM's ConstantRange";

mlir/include/mlir/IR/AttrTypeBase.td

@@ -383,7 +383,9 @@ class StringRefParameter<string desc = "", string value = ""> :
   let defaultValue = value;
 }
 
-// For APInts, which require comparison over different bitwidths
+// For APInts, which require comparison supporting different bitwidths. The
+// default APInt comparison operator asserts when the bitwidths differ, so
+// a custom implementation is necessary.
 class APIntParameter<string desc> :
     AttrOrTypeParameter<"::llvm::APInt", desc> {
   let comparator = "$_lhs.getBitWidth() == $_rhs.getBitWidth() && $_lhs == $_rhs";