[PATCH] D103242: [WIP] Don't delete all llvm.assume instructions in codegenprepare

[Markus Lavin via Phabricator via llvm-commits]

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Only delete those `@llvm.assume`s that including their predecessors (with no other successors) are the sole occupants of a block.

The rationale is that whenever possible we need to preserve the `@llvm.assume`s in IR during codegen as they help guide AA during instruction scheduling.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103242

Files:
  llvm/lib/CodeGen/CodeGenPrepare.cpp
  llvm/test/Transforms/CodeGenPrepare/X86/recursively-delete-dead-instructions.ll

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