Merging MIPS JIT/MCJIT changeset into 3.2 release branch.

Merging r169183:

RuntimeDyld: Fix up r169178. MSVC doesn't like "or".

Merging r169178:

Runtime dynamic linker for MCJIT should support MIPS BigEndian architecture.
This small change adds support for that. It will make all MCJIT tests pass
in make-check on BigEndian platforms.

Patch by Petar Jovanovic.

Merging r169177:

Classic JIT is still being supported by MIPS, along with MCJIT.
This change adds endian-awareness to MipsJITInfo and emitWordLE in
MipsCodeEmitter has become emitWord now to support both endianness.

Patch by Petar Jovanovic.

Merging r169174:

Functions in MipsCodeEmitter.cpp that expand unaligned loads/stores are dead
code. Removing it.

Patch by Petar Jovanovic.

llvm-svn: 169296