Revert "[mips] Fix c.<cc>.<fmt> instruction definition."

This reverts commit r281022. Mips buildbot broke, due to unhandled register
class FCC.

llvm-svn: 281033
diff --git a/llvm/lib/Target/Mips/MipsFastISel.cpp b/llvm/lib/Target/Mips/MipsFastISel.cpp
index 58a53a0..9453164 100644
--- a/llvm/lib/Target/Mips/MipsFastISel.cpp
+++ b/llvm/lib/Target/Mips/MipsFastISel.cpp
@@ -709,10 +709,8 @@
     unsigned RegWithOne = createResultReg(&Mips::GPR32RegClass);
     emitInst(Mips::ADDiu, RegWithZero).addReg(Mips::ZERO).addImm(0);
     emitInst(Mips::ADDiu, RegWithOne).addReg(Mips::ZERO).addImm(1);
-    emitInst(Opc)
-        .addReg(Mips::FCC0, RegState::Define)
-        .addReg(LeftReg)
-        .addReg(RightReg);
+    emitInst(Opc).addReg(LeftReg).addReg(RightReg).addReg(
+        Mips::FCC0, RegState::ImplicitDefine);
     emitInst(CondMovOpc, ResultReg)
         .addReg(RegWithOne)
         .addReg(Mips::FCC0)