[clang] [Inliner] Improve propagation of return attributes. (PR #67756)

[Simon Pilgrim via cfe-commits]

================
@@ -1,5 +1,4 @@
 // RUN: %clang_cc1 -x c -ffreestanding %s -triple=x86_64-apple-darwin -emit-llvm -o - | FileCheck %s
-// RUN: %clang_cc1 -x c++ -std=c++11 -ffreestanding %s -triple=x86_64-apple-darwin -emit-llvm -o - | FileCheck %s
----------------
RKSimon wrote:

It looks like the constexpr tests are still here?

https://github.com/llvm/llvm-project/pull/67756