[turbofan] Improve code generation for unordered comparisons.

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index 0989019c0c67829ccff1f4240fee03d8147e3547..5ca0f12661847747e69e5abb8e09cba6870a2f36 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -252,14 +252,6 @@ std::ostream& operator<<(std::ostream& os, const FlagsCondition& fc) {
       return os << "unordered equal";
     case kUnorderedNotEqual:
       return os << "unordered not equal";
-    case kUnorderedLessThan:
-      return os << "unordered less than";
-    case kUnorderedGreaterThanOrEqual:
-      return os << "unordered greater than or equal";
-    case kUnorderedLessThanOrEqual:
-      return os << "unordered less than or equal";
-    case kUnorderedGreaterThan:
-      return os << "unordered greater than";
     case kOverflow:
       return os << "overflow";
     case kNotOverflow: