[PATCH] D67575: [Coverage] Speed up file-based queries for coverage info, NFC

[Vedant Kumar via Phabricator via llvm-commits]

vsk created this revision.
vsk added a reviewer: Dor1s.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

Speed up queries for coverage info in a file by reducing the amount of
time spent determining whether a function record corresponds to a file.

This gives a 36% speedup when generating a coverage report for `llc`.
The reduction is entirely in user time.

rdar://54758110


https://reviews.llvm.org/D67575

Files:
  llvm/include/llvm/ProfileData/Coverage/CoverageMapping.h
  llvm/lib/ProfileData/Coverage/CoverageMapping.cpp

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