[IR] Initial introduction of memset_pattern

[asb]

Draft PR to accompany RFC: Introducing an llvm.memset_pattern.inline intrinsic.

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 53fecef1ec5cb502900f82b07036b28cb0fb9f0f 920fc95f1735d9fce0524a629a20c77978e4135e -- llvm/include/llvm/CodeGen/SelectionDAG.h llvm/include/llvm/IR/InstVisitor.h llvm/include/llvm/IR/IntrinsicInst.h llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp llvm/lib/IR/Verifier.cpp

View the diff from clang-format here.

diff --git a/llvm/include/llvm/IR/InstVisitor.h b/llvm/include/llvm/IR/InstVisitor.h
index 30a9df8a32..ae57f8c00e 100644
--- a/llvm/include/llvm/IR/InstVisitor.h
+++ b/llvm/include/llvm/IR/InstVisitor.h
@@ -208,7 +208,9 @@ public:
   RetTy visitDbgInfoIntrinsic(DbgInfoIntrinsic &I){ DELEGATE(IntrinsicInst); }
   RetTy visitMemSetInst(MemSetInst &I)            { DELEGATE(MemIntrinsic); }
   RetTy visitMemSetInlineInst(MemSetInlineInst &I){ DELEGATE(MemSetInst); }
-  RetTy visitMemSetPatternInlineInst(MemSetPatternInlineInst &I){ DELEGATE(MemSetInst); }
+  RetTy visitMemSetPatternInlineInst(MemSetPatternInlineInst &I) {
+    DELEGATE(MemSetInst);
+  }
   RetTy visitMemCpyInst(MemCpyInst &I)            { DELEGATE(MemTransferInst); }
   RetTy visitMemCpyInlineInst(MemCpyInlineInst &I){ DELEGATE(MemCpyInst); }
   RetTy visitMemMoveInst(MemMoveInst &I)          { DELEGATE(MemTransferInst); }

[asb]

Superseded by #97583