PATCH: add DOLLARS_IN_ASM_IDENTIFIERS

[Sandra Loosemore]

MIPS assembly language uses identifiers like "$17" as the names of registers.
This patch makes cpp do the right thing with concatenation, etc, by adding a new
target macro.  The existing DOLLARS_IN_IDENTIFIERS applies only to C-like
languages, and conventions for assembly language files may well be different.  OK?

-Sandra


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