Automerge: [update_cc_test_checks] Add test for missing handling of mangled names

We are missing MSVC C++ functions since the name is quoted in the LLVM IR,
so we don't find them in the generated IR and therefore don't add the test
checks. Additionally, there is an issue with finding functions using NEON
types (see llvm/llvm-project#121800).

Pull Request: llvm/llvm-project#121976

Author: arichardson

clang/test/utils/update_cc_test_checks/Inputs/basic-cplusplus.cpp

@@ -1,5 +1,9 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --include-generated-funcs --version 5
 // Basic C++ test for update_cc_test_checks
 // RUN: %clang_cc1 -triple=x86_64-unknown-linux-gnu -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple=x86_64-apple-macho -emit-llvm -o - %s | FileCheck %s --check-prefix=MACHO
+// RUN: %clang_cc1 -triple=x86_64-windows-msvc -emit-llvm -o - %s | FileCheck %s --check-prefix=MSVC
+// RUN: %clang_cc1 -triple=x86_64-windows-gnu -emit-llvm -o - %s | FileCheck %s --check-prefix=MINGW
 
 class Foo {
   int x;
@@ -13,6 +17,8 @@ class Foo {
   inline int function_defined_out_of_line(int arg) const;
 };
 
+[[clang::noinline]] static int static_noinline_fn(int arg) { return arg; }
+
 Foo::Foo(int x) : x(x) {}
 Foo::~Foo() {}
 int Foo::function_defined_out_of_line(int arg) const { return x - arg; }
@@ -22,4 +28,5 @@ int main() {
   Foo f(1);
   f.function_defined_inline(2);
   f.function_defined_out_of_line(3);
+  return static_noinline_fn(0);
 }