[x86] Fix InstructionSelector::SupportedMachineOperatorFlags().

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 190e5c8d8cdf87e4f4872bc842458036e2b6d16b..5c63f6330102146f6bb6c7ee0c6356ea719481b5 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -1374,13 +1374,14 @@ void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
+  MachineOperatorBuilder::Flags flags =
+      MachineOperatorBuilder::kWord32ShiftIsSafe;
   if (CpuFeatures::IsSupported(SSE4_1)) {
-    return MachineOperatorBuilder::kFloat64Floor |
-           MachineOperatorBuilder::kFloat64Ceil |
-           MachineOperatorBuilder::kFloat64RoundTruncate |
-           MachineOperatorBuilder::kWord32ShiftIsSafe;
+    flags |= MachineOperatorBuilder::kFloat64Floor |
+             MachineOperatorBuilder::kFloat64Ceil |
+             MachineOperatorBuilder::kFloat64RoundTruncate;
   }
-  return MachineOperatorBuilder::kNoFlags;
+  return flags;
 }
 
 }  // namespace compiler