Re: [PATCH v1] testsuite: use valid ARM GPR pair in asm-hard-reg-6.c [PR124328]

[Richard Earnshaw via Sourceware Forge]

Ah, the missing information was that to trip the error, you need 
`-march=armv8.1-m.main+mve`.  armv8.1-m.main is not enough on its own.

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https://forge.sourceware.org/gcc/gcc/pulls/217#issuecomment-7188