[turbofan] Improve code generation for unordered comparisons.

src/compiler/instruction-codes.h

Index: src/compiler/instruction-codes.h
diff --git a/src/compiler/instruction-codes.h b/src/compiler/instruction-codes.h
index ea1785417e4af2c27441329cf4dc43faba89319c..daf00afb3ebd161f696ac708868f72bd356826d3 100644
--- a/src/compiler/instruction-codes.h
+++ b/src/compiler/instruction-codes.h
@@ -102,10 +102,6 @@ enum FlagsCondition {
   kUnsignedGreaterThan,
   kUnorderedEqual,
   kUnorderedNotEqual,
-  kUnorderedLessThan,
-  kUnorderedGreaterThanOrEqual,
-  kUnorderedLessThanOrEqual,
-  kUnorderedGreaterThan,
   kOverflow,
   kNotOverflow
 };
@@ -129,7 +125,7 @@ typedef int32_t InstructionCode;
 typedef BitField<ArchOpcode, 0, 7> ArchOpcodeField;
 typedef BitField<AddressingMode, 7, 5> AddressingModeField;
 typedef BitField<FlagsMode, 12, 2> FlagsModeField;
-typedef BitField<FlagsCondition, 14, 5> FlagsConditionField;
+typedef BitField<FlagsCondition, 14, 4> FlagsConditionField;
 typedef BitField<int, 14, 18> MiscField;
 
 }  // namespace compiler