[turbofan] Don't try to inline our builtins.

src/compiler/js-inlining-heuristic.cc

 // Copyright 2015 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-heuristic.h"
 
 #include "src/compiler.h"
 #include "src/compiler/node-matchers.h"
 #include "src/objects-inl.h"
 
@@ skipping 30 matching lines @@
       break;
   }
 
   // ---------------------------------------------------------------------------
   // Everything below this line is part of the inlining heuristic.
   // ---------------------------------------------------------------------------
 
   // Built-in functions are handled by the JSBuiltinReducer.
   if (function->shared()->HasBuiltinFunctionId()) return NoChange();
 
+  // Don't inline builtins.
+  if (function->shared()->IsBuiltin()) return NoChange();
+
   // Quick check on source code length to avoid parsing large candidate.
   if (function->shared()->SourceSize() > FLAG_max_inlined_source_size) {
     return NoChange();
   }
 
   // Quick check on the size of the AST to avoid parsing large candidate.
   if (function->shared()->ast_node_count() > FLAG_max_inlined_nodes) {
     return NoChange();
   }
 
@@ skipping 55 matching lines @@
            candidate.node->id(), candidate.calls,
            candidate.function->shared()->SourceSize(),
            candidate.function->shared()->ast_node_count(),
            candidate.function->shared()->DebugName()->ToCString().get());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8