[llvm] [MIPS]Initial support for MIPS16 assembly. (PR #108681)

[Jesse D via llvm-commits]

jdeguire wrote:

Yeah...sorry about that. I wasn't sure how to break this up since a lot of it needs to be here for the MIPS16 instructions to get parsed. Take all the time you need and thanks!

Oh! On another note, a long time ago on Bugzilla I submitted bug #50595 which is what lead me down the long path of MIPS16. This PR should address that bug report and maybe also #48386. Is there something I need to do to link this PR to those bugs or vice versa?

https://github.com/llvm/llvm-project/pull/108681