[turbofan] Improve code generation for unordered comparisons.

src/compiler/instruction-selector-impl.h

Index: src/compiler/instruction-selector-impl.h
diff --git a/src/compiler/instruction-selector-impl.h b/src/compiler/instruction-selector-impl.h
index adf8492efaba0a1f40586031349e04deb82134b1..a02a6e222327ffae41ad14b77baa84ca20fcaf6e 100644
--- a/src/compiler/instruction-selector-impl.h
+++ b/src/compiler/instruction-selector-impl.h
@@ -303,18 +303,6 @@ class FlagsContinuation FINAL {
       case kUnorderedEqual:
       case kUnorderedNotEqual:
         return;
-      case kUnorderedLessThan:
-        condition_ = kUnorderedGreaterThan;
-        return;
-      case kUnorderedGreaterThanOrEqual:
-        condition_ = kUnorderedLessThanOrEqual;
-        return;
-      case kUnorderedLessThanOrEqual:
-        condition_ = kUnorderedGreaterThanOrEqual;
-        return;
-      case kUnorderedGreaterThan:
-        condition_ = kUnorderedLessThan;
-        return;
     }
     UNREACHABLE();
   }