Thumb32 assembler (17/69)

[Zack Weinberg]

This patch introduces parse_operands, a completely generic routine for
parsing all arguments to an assembly instruction.  At this point it
can only handle registers, but that's enough for a lot of the encoder
routines.

The reject_* functions are a blind alley; I eventually went back to
detecting invalid use of r15 at parse time, and register conflicts
with ad-hoc code.

I'd also like to assure readers that the horrific OP_ and OPS_ macros
are only to facilitate the transition; they go away once every
instruction is parseable using parse_operands.  We won't be getting
there for awhile yet, though.

zw

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