[clang] [llvm] [MC,clang] Fix -Wa,--noexecstack not emitting .note.GNU-stack (PR #187880)

[via cfe-commits]

llvmbot wrote:

<!--IGNORE-->
Failed to cherry-pick: 34bc5d580b73c0ca79653bb03e5c50419be2c634

https://github.com/llvm/llvm-project/actions/runs/23527499548

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/187880