[stubs] Introduce ToIntegerStub and unify the handling of %_ToInteger.

src/crankshaft/hydrogen.cc

 // Copyright 2013 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/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast/ast-numbering.h"
@@ skipping 12265 matching lines @@
 }
 
 
 void HOptimizedGraphBuilder::GenerateToInteger(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* input = Pop();
   if (input->type().IsSmi()) {
     return ast_context()->ReturnValue(input);
   } else {
-    IfBuilder if_inputissmi(this);
-    if_inputissmi.If<HIsSmiAndBranch>(input);
-    if_inputissmi.Then();
-    {
-      // Return the input value.
-      Push(input);
-      Add<HSimulate>(call->id(), FIXED_SIMULATE);
-    }
-    if_inputissmi.Else();
-    {
-      Add<HPushArguments>(input);
-      Push(Add<HCallRuntime>(Runtime::FunctionForId(Runtime::kToInteger), 1));
-      Add<HSimulate>(call->id(), FIXED_SIMULATE);
-    }
-    if_inputissmi.End();
-    return ast_context()->ReturnValue(Pop());
+    Callable callable = CodeFactory::ToInteger(isolate());
+    HValue* stub = Add<HConstant>(callable.code());
+    HValue* values[] = {context(), input};
+    HInstruction* result =
+        New<HCallWithDescriptor>(stub, 0, callable.descriptor(),
+                                 Vector<HValue*>(values, arraysize(values)));
+    return ast_context()->ReturnInstruction(result, call->id());
   }
 }
 
 
 void HOptimizedGraphBuilder::GenerateToName(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* input = Pop();
   if (input->type().IsSmi()) {
     HValue* result = BuildNumberToString(input, Type::SignedSmall());
@@ skipping 1259 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8