Revert other MCTargetDesc change

Author: arsenm

llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h

@@ -57,7 +57,6 @@ createMipsELFObjectWriter(const Triple &TT, bool IsN32);
 std::unique_ptr<MCObjectTargetWriter> createMipsWinCOFFObjectWriter();
 
 namespace MIPS_MC {
-std::string ParseMIPSTriple(const Triple &TT);
 void initLLVMToCVRegMapping(MCRegisterInfo *MRI);
 
 StringRef selectMipsCPU(const Triple &TT, StringRef CPU);