[turbofan] Add TruncateFloat64ToInt32 machine operator.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties-inl.h"
@@ skipping 204 matching lines @@
       break;
     case kArchDeoptimize: {
       int deoptimization_id = MiscField::decode(instr->opcode());
       BuildTranslation(instr, deoptimization_id);
 
       Address deopt_entry = Deoptimizer::GetDeoptimizationEntry(
           isolate(), deoptimization_id, Deoptimizer::LAZY);
       __ call(deopt_entry, RelocInfo::RUNTIME_ENTRY);
       break;
     }
+    case kArchTruncateDoubleToI:
+      __ TruncateDoubleToI(i.OutputRegister(), i.InputDoubleRegister(0));
+      break;
     case kX64Add32:
       ASSEMBLE_BINOP(addl);
       break;
     case kX64Add:
       ASSEMBLE_BINOP(addq);
       break;
     case kX64Sub32:
       ASSEMBLE_BINOP(subl);
       break;
     case kX64Sub:
@@ skipping 761 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ nop(); }
 
 #undef __
 
 }  // namespace internal
 }  // namespace compiler
 }  // namespace v8