[libc] try fixing LlvmLibcStackChkFail.Smash again (llvm#75967)

Looks like adding attributes to lambdas wasn't added to ISO C++ until
C++23.
Forget lambdas and just use a static function.

Author: nickdesaulniers

libc/test/src/compiler/stack_chk_guard_test.cpp

@@ -15,11 +15,13 @@ TEST(LlvmLibcStackChkFail, Death) {
   EXPECT_DEATH([] { __stack_chk_fail(); }, WITH_SIGNAL(SIGABRT));
 }
 
+// Disable asan so that it doesn't immediately fail after the memset, but before
+// the stack canary is re-checked.
+[[gnu::no_sanitize_address]] static void smash_stack() {
+  int arr[20];
+  LIBC_NAMESPACE::memset(arr, 0xAA, 2001);
+}
+
 TEST(LlvmLibcStackChkFail, Smash) {
-  EXPECT_DEATH(
-      [] [[gnu::no_sanitize]] {
-        int arr[20];
-        LIBC_NAMESPACE::memset(arr, 0xAA, 2001);
-      },
-      WITH_SIGNAL(SIGABRT));
+  EXPECT_DEATH(smash_stack, WITH_SIGNAL(SIGABRT));
 }