[Clang][NFC] Use temporary instead of one use local variable when creating APValue (#137029)

Static analysis flagged this code b/c we should have been using
std::move when passing by value since the value is not used anymore. In
this case the simpler fix is just to use a temporary value as many of
the other cases where we simply use MakeIntValue to then create an
APValue result from it.

Author: shafik

clang/lib/Sema/SemaExprCXX.cpp

@@ -6147,9 +6147,8 @@ static APValue EvaluateSizeTTypeTrait(Sema &S, TypeTrait Kind,
       S.Diag(KWLoc, diag::err_arg_is_not_destructurable) << T << ArgRange;
       return APValue();
     }
-    llvm::APSInt V =
-        S.getASTContext().MakeIntValue(*Size, S.getASTContext().getSizeType());
-    return APValue{V};
+    return APValue(
+        S.getASTContext().MakeIntValue(*Size, S.getASTContext().getSizeType()));
     break;
   }
   default: