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[AArch64] Force streaming-compatible codegen when attributes are set.
Before this patch, the only way to generate streaming-compatible code was to use the `-force-streaming-compatible-sve` flag, but the compiler should also avoid the use of instructions invalid in streaming mode when a function has the aarch64_pstate_sm_enabled/compatible attribute. Reviewed By: paulwalker-arm, david-arm Differential Revision: https://reviews.llvm.org/D155428
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llvm/test/Transforms/LoopVectorize/AArch64/streaming-compatible-sve-no-maximize-bandwidth.ll
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