[turbofan] Introduce simplified operator NumberAbs.

test/unittests/compiler/simplified-operator-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/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/simplified-operator-reducer.h"
 #include "src/conversions-inl.h"
@@ skipping 381 matching lines @@
   Node* effect = graph()->start();
   Node* control = graph()->start();
   Node* value = NumberConstant(1.0);
   Reduction reduction = Reduce(graph()->NewNode(
       simplified()->CheckTaggedSigned(), value, effect, control));
   ASSERT_TRUE(reduction.Changed());
   EXPECT_EQ(value, reduction.replacement());
 }
 
 // -----------------------------------------------------------------------------
+// NumberAbs
+
+TEST_F(SimplifiedOperatorReducerTest, NumberAbsWithNumberConstant) {
+  TRACED_FOREACH(double, n, kFloat64Values) {
+    Reduction reduction =
+        Reduce(graph()->NewNode(simplified()->NumberAbs(), NumberConstant(n)));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(), IsNumberConstant(std::fabs(n)));
+  }
+}
+
+// -----------------------------------------------------------------------------
 // ObjectIsSmi
 
 TEST_F(SimplifiedOperatorReducerTest, ObjectIsSmiWithChangeBitToTagged) {
   Node* param0 = Parameter(0);
   Reduction reduction = Reduce(graph()->NewNode(
       simplified()->ObjectIsSmi(),
       graph()->NewNode(simplified()->ChangeBitToTagged(), param0)));
   ASSERT_TRUE(reduction.Changed());
   EXPECT_THAT(reduction.replacement(), IsFalseConstant());
 }
@@ skipping 25 matching lines @@
     Reduction reduction = Reduce(
         graph()->NewNode(simplified()->ObjectIsSmi(), NumberConstant(n)));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(), IsBooleanConstant(IsSmiDouble(n)));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8