[turbofan] Add support for inlining of builtins.

src/compiler/js-inlining.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/js-inlining.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/all-nodes.h"
@@ skipping 310 matching lines @@
 
 
 Reduction JSInliner::Reduce(Node* node) {
   if (node->opcode() != IrOpcode::kJSCallFunction) return NoChange();
 
   JSCallFunctionAccessor call(node);
   HeapObjectMatcher<JSFunction> match(call.jsfunction());
   if (!match.HasValue()) return NoChange();
 
   Handle<JSFunction> function = match.Value().handle();
+  if (!function->IsJSFunction()) return NoChange();
+  if (mode_ == kBuiltinsInlining && !function->shared()->inline_builtin()) {
+    return NoChange();
+  }
 
   CompilationInfoWithZone info(function);
 
   if (!Compiler::ParseAndAnalyze(&info)) return NoChange();
   if (!Compiler::EnsureDeoptimizationSupport(&info)) return NoChange();
 
   if (info.scope()->arguments() != NULL && is_sloppy(info.language_mode())) {
     // For now do not inline functions that use their arguments array.
     SmartArrayPointer<char> name = function->shared()->DebugName()->ToCString();
     if (FLAG_trace_turbo_inlining) {
@@ skipping 39 matching lines @@
       }
     }
   }
 
   return inlinee.InlineAtCall(jsgraph_, node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8