[mips] not instruction alias

This patch adds the single operand form of the not alias to microMIPS and
MIPS along with additional tests.

This partially resolves PR/30381.

Thanks to Sean Bruno for reporting the issue!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287097 91177308-0d34-0410-b5e6-96231b3b80d8
20 files changed