[MIPS] Add support for direct-to-nacl in Clang Cherry-picked r241678 from upstream, modified it to the current PNaCl-Clang tree, and added an extra flag "-direct-to-nacl" that is not present upstream. Original commit message: For Mips direct-to-nacl, the goal is to be close to le32 front-end and use Mips32EL backend. This patch defines new NaClMips32ELTargetInfo and modifies it slightly to be close to le32. It also adds necessary parts, inline with ARM and X86. BUG= https://code.google.com/p/nativeclient/issues/detail?id=4205 R=dschuff@chromium.org Review URL: https://codereview.chromium.org/1208073002 .
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