[clang] [Clang][InstrProf] Allow absolute path in fun.list of -fprofile-list= (PR #67519)

[Ellis Hoag via cfe-commits]

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@@ -139,9 +139,23 @@ std::optional<ProfileList::ExclusionType>
 ProfileList::isFileExcluded(StringRef FileName,
                             CodeGenOptions::ProfileInstrKind Kind) const {
   StringRef Section = getSectionName(Kind);
-  // Check for "source:<regex>=<case>"
+
+  // Convert the input file path to its canonical (absolute) form
+  llvm::SmallString<128> CanonicalFileName(FileName);
+  llvm::sys::fs::make_absolute(CanonicalFileName);
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ellishg wrote:

I consider `src`/`!src` to be a deprecated format and users would probably only use one of the two formats. So I think either case is fine, but this change seems to make more sense to me.
https://clang.llvm.org/docs/UsersManual.html#older-prefixes

https://github.com/llvm/llvm-project/pull/67519