[turbofan] Implemented the optional Float32RoundTiesEven operator.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index 376dbe5cadec2067d9883ac706a5836ff73e5270..1898d1017daa33364557b1f3ae800b7615075f77 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -504,6 +504,9 @@ class RawMachineAssembler {
   Node* Float64RoundTiesAway(Node* a) {
     return AddNode(machine()->Float64RoundTiesAway().op(), a);
   }
+  Node* Float32RoundTiesEven(Node* a) {
+    return AddNode(machine()->Float32RoundTiesEven().op(), a);
+  }
   Node* Float64RoundTiesEven(Node* a) {
     return AddNode(machine()->Float64RoundTiesEven().op(), a);
   }