[patch] Add support for .exitm in the integrated assembler

[Nico Weber]

Hi,

the attached patch adds support for .exitm as documented on
https://sourceware.org/binutils/docs/as/Exitm.html#Exitm , PR20426.
Everything from the current macro expansion after .exitm is ignored; this
matches gas's behavior.

(It also removes the unused TheMacro member from MacroInstantiation.)

Please take a look!

Nico
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