[turbofan] Added the optional Float64RoundTiesEven operator to turbofan.

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 db1a062f61a93b1d4ce63965f07d0a20cc4e26a8..da458bab98e11924b0cd2a782b67e0b35bd9242e 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -491,6 +491,9 @@ class RawMachineAssembler {
   Node* Float64RoundTiesAway(Node* a) {
     return AddNode(machine()->Float64RoundTiesAway().op(), a);
   }
+  Node* Float64RoundTiesEven(Node* a) {
+    return AddNode(machine()->Float64RoundTiesEven().op(), a);
+  }
 
   // Float64 bit operations.
   Node* Float64ExtractLowWord32(Node* a) {