[PATCH] D95279: Support: Remove duplicated code in {File,clang::ModulesDependency}Collector, NFC

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith created this revision.
dexonsmith added reviewers: dblaikie, JDevlieghere.
Herald added subscribers: ributzka, hiraditya.
dexonsmith requested review of this revision.
Herald added projects: clang, LLVM.

Refactor the duplicated canonicalize-path logic in `FileCollector` and
`ModulesDependencyCollector` into a new utility called
`PathCanonicalizer` that's shared. This popped up when tracking down a
bug common to both in https://reviews.llvm.org/D95202.

As drive-bys, update a few names and comments to better reflect the
effect of the code, delay removal of `..`s to avoid an unnecessary extra
string copy, and leave behind a couple of FIXMEs for future
consideration.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95279

Files:
  clang/include/clang/Frontend/Utils.h
  clang/lib/Frontend/ModuleDependencyCollector.cpp
  llvm/include/llvm/Support/FileCollector.h
  llvm/lib/Support/FileCollector.cpp

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