[PATCH] D24045: Tail Duplication: Don't denormalize loops when duplicating early.

[Kyle Butt via llvm-commits]

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Duplicating loop latches, headers, or pre-headers prevents certain loop based
optimizations. Now that we have tail-duplication during placement, it makes
sense to wait to duplicate these blocks until later, to allow other
optimizations to proceed.

Repository:
  rL LLVM

https://reviews.llvm.org/D24045

Files:
  include/llvm/CodeGen/TailDuplicator.h
  lib/CodeGen/MachineBlockPlacement.cpp
  lib/CodeGen/TailDuplication.cpp
  lib/CodeGen/TailDuplicator.cpp
  test/CodeGen/WebAssembly/cfg-stackify.ll
  test/CodeGen/X86/avx512-i1test.ll
  test/CodeGen/X86/tail-dup-no-denormalize-loops.ll

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