[turbofan] Implemented the optional Float32RoundTiesEven operator.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index cd0297b53dc88557c83830980ba9533f7d81eac1..ad296e8027258c17b828f9afd06610f19eb1f2f8 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -122,21 +122,22 @@ class MachineOperatorBuilder final : public ZoneObject {
     kFloat64RoundUp = 1u << 7,
     kFloat32RoundTruncate = 1u << 8,
     kFloat64RoundTruncate = 1u << 9,
-    kFloat64RoundTiesEven = 1u << 10,
-    kFloat64RoundTiesAway = 1u << 11,
-    kInt32DivIsSafe = 1u << 12,
-    kUint32DivIsSafe = 1u << 13,
-    kWord32ShiftIsSafe = 1u << 14,
-    kWord32Ctz = 1u << 15,
-    kWord64Ctz = 1u << 16,
-    kWord32Popcnt = 1u << 17,
-    kWord64Popcnt = 1u << 18,
+    kFloat32RoundTiesEven = 1u << 10,
+    kFloat64RoundTiesEven = 1u << 11,
+    kFloat64RoundTiesAway = 1u << 12,
+    kInt32DivIsSafe = 1u << 13,
+    kUint32DivIsSafe = 1u << 14,
+    kWord32ShiftIsSafe = 1u << 15,
+    kWord32Ctz = 1u << 16,
+    kWord64Ctz = 1u << 17,
+    kWord32Popcnt = 1u << 18,
+    kWord64Popcnt = 1u << 19,
     kAllOptionalOps = kFloat32Max | kFloat32Min | kFloat64Max | kFloat64Min |
                       kFloat32RoundDown | kFloat64RoundDown | kFloat32RoundUp |
                       kFloat64RoundUp | kFloat32RoundTruncate |
                       kFloat64RoundTruncate | kFloat64RoundTiesAway |
-                      kFloat64RoundTiesEven | kWord32Ctz | kWord64Ctz |
-                      kWord32Popcnt | kWord64Popcnt
+                      kFloat32RoundTiesEven | kFloat64RoundTiesEven |
+                      kWord32Ctz | kWord64Ctz | kWord32Popcnt | kWord64Popcnt
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
@@ -279,6 +280,7 @@ class MachineOperatorBuilder final : public ZoneObject {
   const OptionalOperator Float32RoundTruncate();
   const OptionalOperator Float64RoundTruncate();
   const OptionalOperator Float64RoundTiesAway();
+  const OptionalOperator Float32RoundTiesEven();
   const OptionalOperator Float64RoundTiesEven();
 
   // Floating point bit representation.