[clang] [clang][ExprConst] Let diagnostics point to std::allocator calls (PR #123744)

[Shafik Yaghmour via cfe-commits]

================
@@ -1155,7 +1156,7 @@ namespace {
         if (CTSD->isInStdNamespace() && ClassII &&
             ClassII->isStr("allocator") && TAL.size() >= 1 &&
             TAL[0].getKind() == TemplateArgument::Type)
-          return {Call->Index, TAL[0].getAsType()};
+          return {Call->Index, TAL[0].getAsType(), Call->CallExpr};
       }
 
       return {};
----------------
shafik wrote:

So `Call` will be `nullptr` here and following some of the code from 
`createHeapAlloc` I am not sure that is safe. Maybe the combination can't 
happen but it is not obvious to me.

https://github.com/llvm/llvm-project/pull/123744
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