[llvm] DiagnosticInfo: Fix stack-use-after-scope in DiagnosticInfoStackSize (PR #190442)

[Matt Arsenault via llvm-commits]

================
@@ -501,12 +501,13 @@ class LLVM_ABI DiagnosticInfoResourceLimit
 
 class LLVM_ABI DiagnosticInfoStackSize : public DiagnosticInfoResourceLimit {
   void anchor() override;
+  const Twine ResourceName{"stack frame size"};
----------------
arsenm wrote:

Annoying this shadows the base class member 

https://github.com/llvm/llvm-project/pull/190442