aarch64-darwin NCG appears to be broken

A recent CI build has many errors of the form:

/tmp/ghc75623_0/ghc_5.s:448:10: error:
     error: invalid octal escape sequence (out of range) in '.string' directive
            .string "\742\644\633"
                    ^
    |
448 |         .string "\742\644\633"
    |          ^

https://gitlab.haskell.org/ghc/ghc/-/jobs/706035

I actually can't find any jobs which are not broken in some way. It seems that the NCG is quite badly broken still..

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