[clang] [llvm] [Clang] Add `__builtin_stack_address` (PR #148281)

[Matt Arsenault via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -o - | llvm-cxxfilt | FileCheck %s --check-prefixes=COMMON,NO-OPT
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -emit-llvm %s -O3 -o - | llvm-cxxfilt | FileCheck %s --check-prefixes=COMMON,OPT
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arsenm wrote:

Shouldn't be running optimizations in this test. Just stick to the IR emission. If you want to check the inlining behavior, add a separate pure-IR inliner test 

https://github.com/llvm/llvm-project/pull/148281