[mips] Marked up instructions added in MIPS-IV and tested that IAS for -mcpu=mips...

[mips] Marked up instructions added in MIPS-IV and tested that IAS for -mcpu=mips[123] does not accept them

Summary:
This required a new instruction group representing the 32-bit subset of
MIPS-IV that was available in MIPS32

A small number of instructions are correctly rejected but with the wrong error
message. These have been placed in a separate test for now.

Depends on D3676

Reviewers: vmedic

Reviewed By: vmedic

Differential Revision: http://reviews.llvm.org/D3677

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208414 91177308-0d34-0410-b5e6-96231b3b80d8