[turbofan] Add TruncateFloat64ToInt32 machine operator.

src/compiler/change-lowering.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/change-lowering.h"
 
 #include "src/compiler/js-graph.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 106 matching lines @@
   STATIC_ASSERT(kSmiTagMask == 1);
 
   Node* tag = graph()->NewNode(machine()->WordAnd(), val,
                                jsgraph()->Int32Constant(kSmiTagMask));
   Node* branch = graph()->NewNode(common()->Branch(), tag, control);
 
   Node* if_true = graph()->NewNode(common()->IfTrue(), branch);
   Node* load = graph()->NewNode(
       machine()->Load(kMachFloat64), val, HeapNumberValueIndexConstant(),
       graph()->NewNode(common()->ControlEffect(), if_true));
-  Node* change = graph()->NewNode(machine()->ChangeFloat64ToInt32(), load);
+  Node* change = graph()->NewNode(machine()->TruncateFloat64ToInt32(), load);
 
   Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
   Node* integer =
       graph()->NewNode(machine()->WordSar(), val, SmiShiftBitsConstant());
   Node* number =
       machine()->is64()
           ? graph()->NewNode(machine()->TruncateInt64ToInt32(), integer)
           : integer;
 
   Node* merge = graph()->NewNode(common()->Merge(2), if_true, if_false);
@@ skipping 59 matching lines @@
       jsgraph()->Int32Constant(function->nargs), context, effect, control);
   Node* store = graph()->NewNode(
       machine()->Store(kMachFloat64, kNoWriteBarrier), heap_number,
       HeapNumberValueIndexConstant(), value, heap_number, control);
   return graph()->NewNode(common()->Finish(1), heap_number, store);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8