[Driver][Mips] Support more MIPS CPU names: mips1 - mips5.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212338 91177308-0d34-0410-b5e6-96231b3b80d8
[Driver][Mips] Support one more MIPS CPU name - octeon.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@212339 91177308-0d34-0410-b5e6-96231b3b80d8