[MC][mips] Add MipsMCInstrAnalysis class and register it as MC instruction analyzer

The `MipsMCInstrAnalysis` class overrides the `evaluateBranch` method
and calculates target addresses for branch and calls instructions.
That allows llvm-objdump to print functions' names in branch instructions
in the disassemble mode.

Differential Revision: http://reviews.llvm.org/D18209

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264309 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed