MIPS: Major fixes and clean-up in asm. for instruction encoding.

src/mips/constants-mips.cc

Index: src/mips/constants-mips.cc
diff --git a/src/mips/constants-mips.cc b/src/mips/constants-mips.cc
index 419462311a4a0063e80f2922e92478fae70de539..7ecfe742955950e4d008480a5652b45d149d7fce 100644
--- a/src/mips/constants-mips.cc
+++ b/src/mips/constants-mips.cc
@@ -282,8 +282,6 @@ Instruction::Type Instruction::InstructionType() const {
         case BC1:   // Branch on coprocessor condition.
         case BC1EQZ:
         case BC1NEZ:
-        case SELEQZ_C:
-        case SELNEZ_C:
           return kImmediateType;
         default:
           return kRegisterType;