[clang] [Clang] Fix -Wunused-variable in #211482 (PR #215134)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Aiden Grossman (boomanaiden154)

<details>
<summary>Changes</summary>

This is only used in asserts, so fails in a release build without asserts with -Werror -Wunused-variable with the latest clang.

---
Full diff: https://github.com/llvm/llvm-project/pull/215134.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaExprCXX.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 6cc80c8254a78..a76146a8d914f 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -2965,12 +2965,12 @@ ImplicitAllocationArguments::ImplicitAllocationArguments(
       PassAlignment(alignedAllocationModeFromBool(AlignArg)),
       IsMSVCCompatibilityFallback(IsMSVCCompatibilityFallback),
       ArgumentCount(0) {
-  ASTContext &Ctx = SemaRef.getASTContext();
   if (TypeIdentityArg) {
     assert(SemaRef.isStdTypeIdentity(TypeIdentityArg->getType(), nullptr));
     ImplicitArguments[ArgumentCount++] = TypeIdentityArg;
   }
   assert(SizeArg);
+  [[maybe_unused]] ASTContext &Ctx = SemaRef.getASTContext();
   assert(Ctx.hasSameType(SizeArg->getType(), Ctx.getSizeType()));
   ImplicitArguments[ArgumentCount++] = SizeArg;
   if (AlignArg) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/215134