Make SHA aarch64 assembly build with gcc.

gcc is extremely fussy about register naming and insists on q and s naming
for the ARM CE SHA instructions, even though they're referring to the same
register (while LLVM just figures it out). Work around this by mapping
registers to their required variant at usage and defining a handful of
mappings between v registers and alternate names/views.

This is still somewhat ugly, but seems to be one of the cleaner options
that will allow portable to enable SHA assembly on platforms that use gcc.

ok kenjiro@ tb@

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