[clang] [clang][FMV][AArch64] Improve streaming mode compatibility. (PR #100181)

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llvmbot wrote:

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Failed to cherry-pick: [f8ae128](https://github.com/llvm/llvm-project/commit/f8ae128755777424cf4133e4e8e819c0bc08d2b1)

https://github.com/llvm/llvm-project/actions/runs/10140964466

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/100181