[turbofan] Introduce TruncateTaggedToWord32 simplified operator.

test/cctest/compiler/test-run-machops.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 <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 5305 matching lines @@
   m.Return(m.TruncateInt64ToInt32(
       m.LoadFromPointer(&expected, MachineType::Int64())));
   FOR_UINT32_INPUTS(i) {
     FOR_UINT32_INPUTS(j) {
       expected = (static_cast<uint64_t>(*j) << 32) | *i;
       CHECK_EQ(static_cast<int32_t>(expected), m.Call());
     }
   }
 }
 
-
-TEST(RunTruncateFloat64ToInt32P) {
+TEST(RunTruncateFloat64ToWord32P) {
   struct {
     double from;
     double raw;
   } kValues[] = {{0, 0},
                  {0.5, 0},
                  {-0.5, 0},
                  {1.5, 1},
                  {-1.5, -1},
                  {5.5, 5},
                  {-5.0, -5},
@@ skipping 40 matching lines @@
                  {9.6714157802890681e+24, -2147483648.0},
                  {-9.6714157802890681e+24, -2147483648.0},
                  {1.9342813113834065e+25, 2147483648.0},
                  {-1.9342813113834065e+25, 2147483648.0},
                  {3.868562622766813e+25, 0},
                  {-3.868562622766813e+25, 0},
                  {1.7976931348623157e+308, 0},
                  {-1.7976931348623157e+308, 0}};
   double input = -1.0;
   RawMachineAssemblerTester<int32_t> m;
-  m.Return(m.TruncateFloat64ToInt32(
-      TruncationMode::kJavaScript,
+  m.Return(m.TruncateFloat64ToWord32(
       m.LoadFromPointer(&input, MachineType::Float64())));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     input = kValues[i].from;
     uint64_t expected = static_cast<int64_t>(kValues[i].raw);
     CHECK_EQ(static_cast<int>(expected), m.Call());
   }
 }
 
 
 TEST(RunChangeFloat32ToFloat64) {
@@ skipping 842 matching lines @@
   r.Goto(&merge);
   r.Bind(&merge);
   Node* phi = r.Phi(MachineRepresentation::kWord32, fa, fb);
   r.Return(phi);
   CHECK_EQ(1, r.Call(1));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8