[PATCH] D78659: Add nomerge function attribute to supress tail merge optimization in simplifyCFG

[Zequan Wu via Phabricator via cfe-commits]

zequanwu created this revision.
zequanwu added reviewers: asbirlea, rnk.
zequanwu added projects: LLVM, clang.
Herald added subscribers: cfe-commits, hiraditya.

We want to add a way to avoid tail calls to noreturn function from being merged. 
This patch add nomerge to disable the optimization in IR level.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78659

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/lib/CodeGen/CGCall.cpp
  llvm/include/llvm/IR/Attributes.td
  llvm/include/llvm/IR/InstrTypes.h
  llvm/lib/IR/Attributes.cpp
  llvm/lib/IR/Verifier.cpp
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp

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