[compiler-rt] [profile] Implement a non-mmap path when reading profile files from a non-local filesystem (PR #131177)

[David Li via llvm-commits]

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@@ -258,6 +267,120 @@ COMPILER_RT_VISIBILITY FILE *lprofOpenFileEx(const char *ProfileName) {
   return f;
 }
 
+// Return 1 (true) if the file descriptor Fd represents a file that is on a
+// local filesystem, otherwise return 0.
+COMPILER_RT_UNUSED static int is_local_filesystem(int Fd) {
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david-xl wrote:

guard the whole function body with #ifdef AIX

https://github.com/llvm/llvm-project/pull/131177