[clang] [analyzer] Delay the checker constructions after parsing (PR #127409)

[Gábor Horváth via cfe-commits]

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@@ -73,6 +73,23 @@ Nullability getNullabilityAnnotation(QualType Type);
 /// returned.
 std::optional<int> tryExpandAsInteger(StringRef Macro, const Preprocessor &PP);
 
+class CachedMacroValue {
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Xazax-hun wrote:

I think with the optional we cannot distinguish between the case whether the `tryExpandAsInteger` failed or it was not called yet. Here, it is part of the type's contract that the `tryExpandAsInteger` was already called. 

https://github.com/llvm/llvm-project/pull/127409