[PATCH] D158890: [PGO] Adds branch accuracy metric script and x86 branch tracing tool.

[Micah Weston via Phabricator via llvm-commits]

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[2/2] This is the second of two patches for branch accuracy metrics.

Depends on D158889 <https://reviews.llvm.org/D158889>

Patch adds a utility script for collecting branch accuracy metrics and a pin tool file
for tracing branches on x86. The metrics currently just support x86 but should be
extensible for other targets as well.

The script consumes compiler branch probabilities (from patch 1 of 2) and branch
traces (from Pin) to generate overall statistics about branch accuracy and a CSV of
individual jump accuracy. These metrics should help judging accuracy of PGO 
generate branch weights.

We've been using these metrics at MediaTek to help track PGO accuracy changes
and find bugs in our toolchain.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158890

Files:
  llvm/utils/BranchAccuracy/README.md
  llvm/utils/BranchAccuracy/X86/cond_br_trace.cpp
  llvm/utils/BranchAccuracy/X86/makefile
  llvm/utils/BranchAccuracy/X86/makefile.rules
  llvm/utils/BranchAccuracy/branch_accuracy_data.py

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