[clang] [llvm] Remove __arm_atomic_store_with_stshh from llvm (PR #192419)

[Paul Walker via cfe-commits]

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paulwalker-arm wrote:

Verifying we can upgrade bitcode is the requirement.  The textual IR side of things offers not such guarantee, it's just convenient and generally comes for free when adding the bitcode support.

Given we want to remove the intrinsic, you'll need to add a `.bc` file. They usually exist along side the `.ll`, with names that include the version of LLVM required to generate the bitcode. e.g. `llvm/test/Bitcode/aarch64-stshh-atomic-store-22.1.{ll,bc}`.

https://github.com/llvm/llvm-project/pull/192419