[MIPS] Initial support for MIPS architecture.

llvm/lib/Target/Mips/MipsTargetMachine.cpp

Index: llvm/lib/Target/Mips/MipsTargetMachine.cpp
===================================================================
--- a/llvm/lib/Target/Mips/MipsTargetMachine.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetMachine.cpp
@@ -91,6 +91,12 @@ addPreEmitPass(PassManagerBase &PM, Code
 addPreEmitPass(PassManagerBase &PM, CodeGenOpt::Level OptLevel)
 {
   PM.add(createMipsDelaySlotFillerPass(*this));
+
+  // @LOCALMOD-START
+  // This pass does all the heavy sfi lifting.
+  PM.add(createMipsNaClRewritePass());
+  // @LOCALMOD-END
+
   return true;
 }