[Clang][AArch64] Diagnostics for SME attributes when target doesn't have 'sme'

This patch adds error diagnostics to Clang when code uses the AArch64 SME
attributes without specifying 'sme' as available target attribute.

* Function definitions marked as '__arm_streaming', '__arm_locally_streaming',
  '__arm_shared_za' or '__arm_new_za' will by definition use or require SME
  instructions.
* Calls from non-streaming functions to streaming-functions require
  the compiler to enable/disable streaming-SVE mode around the call-site.

In some cases we can accept the SME attributes without having 'sme' enabled:
* Function declaration can have the SME attributes.
* Definitions can be __arm_streaming_compatible since the generated
  code should execute on processing elements without SME.

Reviewed By: paulwalker-arm

Differential Revision: https://reviews.llvm.org/D157269