[all-commits] [llvm/llvm-project] c9790f: [IR] Use SmallDenseSet (NFC) (#79556)

[Kazu Hirata via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c9790f8f733f6014fdd8bdacb057c9871e624bcc
      https://github.com/llvm/llvm-project/commit/c9790f8f733f6014fdd8bdacb057c9871e624bcc
  Author: Kazu Hirata <kazu at google.com>
  Date:   2024-01-26 (Fri, 26 Jan 2024)

  Changed paths:
    M llvm/lib/IR/Instruction.cpp

  Log Message:
  -----------
  [IR] Use SmallDenseSet (NFC) (#79556)

The use of SmallDenseSet saves 0.39% of heap allocations during the
compilation of a large preprocessed file, namely X86ISelLowering.cpp,
for the X86 target.  During the experiment, WL.size() was 2 or less
99.9% of the time.  The inline size of 4 should accommodate up to 2
entries at the 3/4 occupancy rate.