[PATCH 4/4] kselftest/arm64: Fix compilation of SME instructions in the arm64 fp tests

[Mark Brown]

On Fri, Nov 08, 2024 at 01:49:20PM +0000, Catalin Marinas wrote:

> SMSTOP/SMSTART require the SME arch extension for the assembler. Add
> '.arch_extension sme' to za-test.S and zt-test.S.

I've got an alternative, more idiomatic fix for this running through my
testing - SME is still relatively recent so we can't rely on people's
toolchains having it and we should use a .inst instead.  The issue was
that the toolchain I'm using locally appears to default to a full fat
version of the architecture and happily assembled the SMSTART even
though we don't have a .inst macro for it like we do with SMSTOP (which
is why that didn't error).  We only have SMSTART SM and SMSTART ZA.
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