[clang] [Clang] Add FileCheck lines to atomic-auto-type codegen test (PR #206749)

[Erich Keane via cfe-commits]

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@@ -1,9 +1,15 @@
-// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s > /dev/null
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -emit-llvm -o - %s | FileCheck %s
 
 // This is a regression test for handling of __auto_type inside _Atomic.
 // Previously this could lead to an undeduced AutoType escaping into
 // ASTContext::getTypeInfoImpl and causing an assertion failure.
 
+// CHECK-LABEL: define {{.*}} @f(
+// CHECK: %xa = alloca double
+// CHECK: %ax = alloca double
+// CHECK: store double {{.*}}, ptr %xa
+// CHECK: store double {{.*}}, ptr %ax
+
 void f(double x) {
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erichkeane wrote:

Can we get a test here where the atomic requires a lock?  It isn't clear to me from this test that we're treating this as anything but a '_Atomic does nothing'.

https://github.com/llvm/llvm-project/pull/206749