[PATCH] D86864: [MachineSinking] sink more profitable loads

[ChenZheng via Phabricator via llvm-commits]

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Instead of setting Store to true blindly, handle some cases where Store can be determined by some analysis if `MI.parent()` dom `SuccToSinkTo` and `SuccToSinkTo` post dom `MI.parent()`.

Thus we can get more profitable loads to be sunk.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86864

Files:
  llvm/lib/CodeGen/MachineSink.cpp
  llvm/test/CodeGen/RISCV/select-optimize-multiple.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/reductions.ll
  llvm/test/CodeGen/X86/2007-01-13-StackPtrIndex.ll
  llvm/test/CodeGen/X86/MachineSink-eflags.ll
  llvm/test/CodeGen/X86/avx2-masked-gather.ll
  llvm/test/CodeGen/X86/cmovcmov.ll
  llvm/test/CodeGen/X86/select.ll
  llvm/test/CodeGen/X86/vec_int_to_fp.ll

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