[llvm] [AArch64][SME]Check streaming mode when using SME2 instruction in fra… (PR #109680)

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CarolineConcatto wrote:

> It should be, the isStreaming() gets its value from AArch64TargetMachine::getSubtargetImpl which sets it if either -force-streaming=true, or if the function has the (locally) streaming attribute.
> 
> It's probably worth adding a test-case though.

I believe I added a check for that, but the test for streaming compatible does not use the pair of LD/ST .
What am I missing?

https://github.com/llvm/llvm-project/pull/109680