Drop IsPregenerated() and allow_stub_calls flag.

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 233 matching lines @@
 Handle<Code> HydrogenCodeStub::GenerateLightweightMissCode(Isolate* isolate) {
   Factory* factory = isolate->factory();
 
   // Generate the new code.
   MacroAssembler masm(isolate, NULL, 256);
 
   {
     // Update the static counter each time a new code stub is generated.
     isolate->counters()->code_stubs()->Increment();
 
-    // Nested stubs are not allowed for leaves.
-    AllowStubCallsScope allow_scope(&masm, false);
-
     // Generate the code for the stub.
     masm.set_generating_stub(true);
     NoCurrentFrameScope scope(&masm);
     GenerateLightweightMiss(&masm);
   }
 
   // Create the code object.
   CodeDesc desc;
   masm.GetCode(&desc);
 
@@ skipping 1064 matching lines @@
   return BuildUncheckedDictionaryElementLoad(receiver, key);
 }
 
 
 Handle<Code> KeyedLoadDictionaryElementStub::GenerateCode(Isolate* isolate) {
   return DoGenerateCode(isolate, this);
 }
 
 
 } }  // namespace v8::internal