[turbofan] Added the optional Float64RoundTiesEven operator to turbofan.

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 47df78565688f1a8d33183231bf5cce0c2b401a4..fa73763383d762a748d363b3576f2704dbdeea56 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -597,14 +597,17 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArm64Float64RoundDown:
       __ Frintm(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float64RoundUp:
+      __ Frintp(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kArm64Float64RoundTiesAway:
       __ Frinta(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Float64RoundTruncate:
       __ Frintz(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
-    case kArm64Float64RoundUp:
-      __ Frintp(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+    case kArm64Float64RoundTiesEven:
+      __ Frintn(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Add:
       __ Add(i.OutputRegister(), i.InputOrZeroRegister64(0),