[turbofan] Fix optimized lowering of Math.imul.

test/unittests/compiler/js-builtin-reducer-unittest.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/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/typer.h"
 #include "src/isolate-inl.h"
@@ skipping 131 matching lines @@
 // Math.imul
 
 
 TEST_F(JSBuiltinReducerTest, MathImul) {
   Node* function = MathFunction("imul");
 
   Node* effect = graph()->start();
   Node* control = graph()->start();
   Node* context = UndefinedConstant();
   Node* frame_state = graph()->start();
-  TRACED_FOREACH(Type*, t0, kIntegral32Types) {
-    TRACED_FOREACH(Type*, t1, kIntegral32Types) {
+  TRACED_FOREACH(Type*, t0, kNumberTypes) {
+    TRACED_FOREACH(Type*, t1, kNumberTypes) {
       Node* p0 = Parameter(t0, 0);
       Node* p1 = Parameter(t1, 1);
       Node* call = graph()->NewNode(javascript()->CallFunction(4), function,
                                     UndefinedConstant(), p0, p1, context,
                                     frame_state, frame_state, effect, control);
       Reduction r = Reduce(call);
 
       ASSERT_TRUE(r.Changed());
-      EXPECT_THAT(r.replacement(), IsInt32Mul(p0, p1));
+      EXPECT_THAT(r.replacement(),
+                  IsNumberImul(IsNumberToUint32(p0), IsNumberToUint32(p1)));
     }
   }
 }
 
 
 // -----------------------------------------------------------------------------
 // Math.fround
 
 
 TEST_F(JSBuiltinReducerTest, MathFround) {
@@ skipping 11 matching lines @@
     Reduction r = Reduce(call);
 
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(), IsTruncateFloat64ToFloat32(p0));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8