[Patch] Handle .ehword pseudo-op for MIPS

[Moore, Catherine]

Hi Richard,
This is the next piece of the compact exception handling implementation.  This patch enables support for the .ehword pseudo-op.
Okay to commit?
Thanks,
Catherine

MIPS Compact Exception Handling Specification:
https://github.com/MentorEmbedded/cxx-abi/blob/master/MIPSCompactEH.pdf


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