[llvm] [Instructions] cache computed shufflevector properties (PR #115536)

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``````````bash
git-clang-format --diff ac4bd74190fedfbe025ef757ff308dd184a507f5 8a66a24cd42835c58cbfee73f85bb16f474e729b --extensions h,cpp -- llvm/include/llvm/IR/Instructions.h llvm/lib/IR/Instructions.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/IR/Instructions.cpp b/llvm/lib/IR/Instructions.cpp
index 987bf2a031..f858c2d9df 100644
--- a/llvm/lib/IR/Instructions.cpp
+++ b/llvm/lib/IR/Instructions.cpp
@@ -2143,7 +2143,8 @@ bool ShuffleVectorInst::isIdentityWithExtract() const {
   if (NumMaskElts >= NumOpElts)
     return CachedShuffleProperties.isIdentityWithExtract = false;
 
-  return CachedShuffleProperties.isIdentityWithExtract = isIdentityMaskImpl(getShuffleMask(), NumOpElts);
+  return CachedShuffleProperties.isIdentityWithExtract =
+             isIdentityMaskImpl(getShuffleMask(), NumOpElts);
 }
 
 bool ShuffleVectorInst::isConcat() const {

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https://github.com/llvm/llvm-project/pull/115536