[llvm] [StaticDataLayout][PGO] Add profile format for static data layout, and the classes to operate on the profiles. (PR #138170)

[Teresa Johnson via llvm-commits]

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@@ -357,6 +357,12 @@ void createPGONameMetadata(GlobalObject &GO, StringRef PGOName);
 /// the duplicated profile variables for Comdat functions.
 bool needsComdatForCounter(const GlobalObject &GV, const Module &M);
 
+/// \c NameStrings is a string composed of one of more possibly encoded
+/// sub-strings. The substrings are separated by 0 or more zero bytes. This
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teresajohnson wrote:

maybe "null" bytes? the "0" and "zero" are confusing.

https://github.com/llvm/llvm-project/pull/138170