[llvm] [StaticDataLayout][PGO]Implement reader and writer change for data access profiles (PR #139997)

[Mingming Liu via llvm-commits]

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@@ -225,6 +228,8 @@ static Error writeMemProfRadixTreeBased(
   OS.write(0ULL); // Reserve space for the memprof call stack payload offset.
   OS.write(0ULL); // Reserve space for the memprof record payload offset.
   OS.write(0ULL); // Reserve space for the memprof record table offset.
+  if (Version == memprof::Version4)
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mingmingl-llvm wrote:

Updated check to be `>=` here and around L 277.

> does the version need to be bumped for this change?

Yeah, that's a good question. https://github.com/llvm/llvm-project/commit/099a0fa3f2cf1a434e20b2fa97b6251088321467 (by @snehasish) introduces v4 which contains `CalleeGuids` in `CallSiteInfo`, and this change changes the v4 format in place with data access profiles.

Snehasish and I have been discussing to bump the version once and enable v4 profiles with both features, assuming waiting for this change won't delay the callsite change too long. I updated the PR description to call this out.

https://github.com/llvm/llvm-project/pull/139997