[turbofan] Fix incorrect minus zero handling in the unit tests.

test/unittests/compiler/change-lowering-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/code-stubs.h"
 #include "src/compiler/change-lowering.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/simplified-operator.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
 #include "test/unittests/compiler/graph-unittest.h"
 #include "test/unittests/compiler/node-test-utils.h"
 #include "testing/gmock-support.h"
 
 using testing::_;
 using testing::AllOf;
+using testing::BitEq;
 using testing::Capture;
 using testing::CaptureEq;
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class ChangeLoweringTest : public GraphTest {
  public:
   ChangeLoweringTest() : simplified_(zone()) {}
@@ skipping 43 matching lines @@
     ChangeLowering reducer(&jsgraph, &linkage);
     return reducer.Reduce(node);
   }
 
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
 
   Matcher<Node*> IsAllocateHeapNumber(const Matcher<Node*>& effect_matcher,
                                       const Matcher<Node*>& control_matcher) {
     return IsCall(_, IsHeapConstant(Unique<HeapObject>::CreateImmovable(
                          AllocateHeapNumberStub(isolate()).GetCode())),
-                  IsNumberConstant(0.0), effect_matcher, control_matcher);
+                  IsNumberConstant(BitEq(0.0)), effect_matcher,
+                  control_matcher);
   }
   Matcher<Node*> IsLoadHeapNumber(const Matcher<Node*>& value_matcher,
                                   const Matcher<Node*>& control_matcher) {
     return IsLoad(kMachFloat64, value_matcher,
                   IsIntPtrConstant(HeapNumberValueOffset()), graph()->start(),
                   control_matcher);
   }
   Matcher<Node*> IsIntPtrConstant(int value) {
     return Is32() ? IsInt32Constant(value) : IsInt64Constant(value);
   }
@@ skipping 360 matching lines @@
               IsIfTrue(AllOf(CaptureEq(&branch),
                              IsBranch(IsUint32LessThanOrEqual(
                                           val, IsInt32Constant(SmiMaxValue())),
                                       graph()->start()))),
               AllOf(CaptureEq(&if_false), IsIfFalse(CaptureEq(&branch))))));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8