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

[Mingming Liu via llvm-commits]

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@@ -41,6 +41,8 @@ namespace data_access_prof {
 struct SourceLocation {
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mingmingl-llvm wrote:

this makes sense. Renamed namespace in this patch and I'm open to split renames to a separate patch before this one.

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