[PATCH] [mips] Improve support for the .set mips16/nomips16 assembler directives.

[Daniel Sanders]

You're right that MIPS16 hasn't been implemented for the integrated assembler yet. This adds some support and enables testing of .cpload/.cprestore so LGTM

Could you explain how you improved these directives in the commit message though. As written, it's not very helpful for those without the context.

http://reviews.llvm.org/D5462