[turbofan] Add TruncateFloat64ToInt32 machine operator.

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler-intrinsics.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 56 matching lines @@
         return value >= -4095 && value <= 4095;
 
       case kArmLoadWord16:
       case kArmStoreWord16:
         return value >= -255 && value <= 255;
 
       case kArchJmp:
       case kArchNop:
       case kArchRet:
       case kArchDeoptimize:
+      case kArchTruncateDoubleToI:
       case kArmMul:
       case kArmMla:
       case kArmMls:
       case kArmSdiv:
       case kArmUdiv:
       case kArmBfc:
       case kArmUbfx:
       case kArmCallCodeObject:
       case kArmCallJSFunction:
       case kArmCallAddress:
@@ skipping 864 matching lines @@
     DCHECK(cont->IsSet());
     Emit(cont->Encode(kArmVcmpF64), g.DefineAsRegister(cont->result()),
          g.UseDoubleRegister(m.left().node()),
          g.UseDoubleRegister(m.right().node()));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8