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

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: mkovacevic99

<details>
<summary>Changes</summary>

Follow-up to #<!-- -->197874. The codegen test was missing FileCheck lines, making it a no-op. Add checks that verify both __auto_type _Atomic and _Atomic __auto_type produce correct allocas and stores.


Follow up to comment from: https://github.com/llvm/llvm-project/pull/197874#discussion_r3496368126

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


1 Files Affected:

- (modified) clang/test/CodeGen/atomic-auto-type.c (+7-1) 


``````````diff
diff --git a/clang/test/CodeGen/atomic-auto-type.c b/clang/test/CodeGen/atomic-auto-type.c
index 0969f22596421..dd9f587b92b71 100644
--- a/clang/test/CodeGen/atomic-auto-type.c
+++ b/clang/test/CodeGen/atomic-auto-type.c
@@ -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) {
   __auto_type _Atomic xa = x;
   _Atomic __auto_type ax = x;

``````````

</details>


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