[clang] [Coverage] Introduce the type `CounterPair` for RegionCounterMap. NFC. (PR #112724)

[NAKAMURA Takumi via cfe-commits]

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@@ -362,6 +362,8 @@ CodeGenFunction::AddInitializerToStaticVarDecl(const VarDecl &D,
     return GV;
   }
 
+  PGO.markStmtMaybeUsed(D.getInit()); // FIXME: Too lazy
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chapuni wrote:

It marks entire the initializer as "don't check further". Just for checks and will not affect actual code generation.

I'll sink it to other places when we will get issues.

https://github.com/llvm/llvm-project/pull/112724