Thumb32 assembler (3/69)

[Zack Weinberg]

This is the first in a long, long series of preparatory patches which
decouple the parsing of assembly language from the generation of
machine code.  This is desirable because the Thumb32 syntax is almost
the same as the ARM syntax, so it's best to share the parser.

Here, I create a single function for parsing immediate operands, which
encapsulates the somewhat complicated calling sequence for
my_get_expression, and does range checks too.

zw

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