Use a different calling convention attribute

Author: yuxuanchen1997

clang/test/SemaCXX/template-instantiation.cpp

@@ -1,11 +1,11 @@
-// RUN: %clang_cc1 -verify -fsyntax-only -Wno-ignored-attributes %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -verify -fsyntax-only %s
 // expected-no-diagnostics
 
 namespace GH76521 {
 
 template <typename T>
 void foo() {
-  auto l = []() __attribute__((pcs("aapcs-vfp"))) {};
+  auto l = []() __attribute__((preserve_most)) {};
 }
 
 void bar() {