[turbofan] Add the TruncateFloat32ToInt32 operator to turbofan.

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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 929 matching lines @@
     case kSSEFloat32ToFloat64:
       ASSEMBLE_SSE_UNOP(Cvtss2sd);
       break;
     case kSSEFloat32Round: {
       CpuFeatureScope sse_scope(masm(), SSE4_1);
       RoundingMode const mode =
           static_cast<RoundingMode>(MiscField::decode(instr->opcode()));
       __ Roundss(i.OutputDoubleRegister(), i.InputDoubleRegister(0), mode);
       break;
     }
+    case kSSEFloat32ToInt32:
+      if (instr->InputAt(0)->IsDoubleRegister()) {
+        __ Cvttss2si(i.OutputRegister(), i.InputDoubleRegister(0));
+      } else {
+        __ Cvttss2si(i.OutputRegister(), i.InputOperand(0));
+      }
+      break;
     case kSSEFloat64Cmp:
       ASSEMBLE_SSE_BINOP(Ucomisd);
       break;
     case kSSEFloat64Add:
       ASSEMBLE_SSE_BINOP(addsd);
       break;
     case kSSEFloat64Sub:
       ASSEMBLE_SSE_BINOP(subsd);
       break;
     case kSSEFloat64Mul:
@@ skipping 1161 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8