Extend JSBuiltinReducer to cover Math.abs as well.

src/compiler/graph-unittest.h

 // 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.
 
 #ifndef V8_COMPILER_GRAPH_UNITTEST_H_
 #define V8_COMPILER_GRAPH_UNITTEST_H_
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 69 matching lines @@
 Matcher<Node*> IsCall(const Matcher<CallDescriptor*>& descriptor_matcher,
                       const Matcher<Node*>& value0_matcher,
                       const Matcher<Node*>& value1_matcher,
                       const Matcher<Node*>& value2_matcher,
                       const Matcher<Node*>& value3_matcher,
                       const Matcher<Node*>& effect_matcher,
                       const Matcher<Node*>& control_matcher);
 
 Matcher<Node*> IsNumberLessThan(const Matcher<Node*>& lhs_matcher,
                                 const Matcher<Node*>& rhs_matcher);
+Matcher<Node*> IsNumberSubtract(const Matcher<Node*>& lhs_matcher,
+                                const Matcher<Node*>& rhs_matcher);
 
 Matcher<Node*> IsLoad(const Matcher<LoadRepresentation>& rep_matcher,
                       const Matcher<Node*>& base_matcher,
                       const Matcher<Node*>& index_matcher,
                       const Matcher<Node*>& effect_matcher);
 Matcher<Node*> IsStore(const Matcher<MachineType>& type_matcher,
                        const Matcher<WriteBarrierKind>& write_barrier_matcher,
                        const Matcher<Node*>& base_matcher,
                        const Matcher<Node*>& index_matcher,
                        const Matcher<Node*>& value_matcher,
@@ skipping 32 matching lines @@
 Matcher<Node*> IsTruncateFloat64ToFloat32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsTruncateFloat64ToInt32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsTruncateInt64ToInt32(const Matcher<Node*>& input_matcher);
 Matcher<Node*> IsFloat64Sqrt(const Matcher<Node*>& input_matcher);
 
 }  //  namespace compiler
 }  //  namespace internal
 }  //  namespace v8
 
 #endif  // V8_COMPILER_GRAPH_UNITTEST_H_