Revert of Steps towards unification of number bitset and range types.

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"
@@ skipping 193 matching lines @@
             IsMerge(AllOf(CaptureEq(&if_true), IsIfTrue(CaptureEq(&branch))),
                     IsIfFalse(AllOf(CaptureEq(&branch),
                                     IsBranch(IsProjection(1, CaptureEq(&add)),
                                              graph()->start()))))));
 }
 
 
 TARGET_TEST_F(ChangeLowering32Test, ChangeInt32ToTaggedSmall) {
   Node* val = Parameter(0);
   Node* node = graph()->NewNode(simplified()->ChangeInt32ToTagged(), val);
-  NodeProperties::SetBounds(val, Bounds(Type::None(), Type::Signed31()));
+  NodeProperties::SetBounds(val, Bounds(Type::None(), Type::SignedSmall()));
   Reduction reduction = Reduce(node);
   ASSERT_TRUE(reduction.Changed());
 
   Node* change = reduction.replacement();
   Capture<Node*> add, branch, heap_number, if_true;
   EXPECT_THAT(change, IsWord32Shl(val, IsInt32Constant(SmiShiftAmount())));
 }
 
 
 TARGET_TEST_F(ChangeLowering32Test, ChangeTaggedToFloat64) {
@@ skipping 229 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