Add asserts to ensure that we:

src/code-stubs.cc

 // Copyright 2011 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 34 matching lines @@
     return true;
   }
   return false;
 }
 
 
 void CodeStub::GenerateCode(MacroAssembler* masm) {
   // Update the static counter each time a new code stub is generated.
   masm->isolate()->counters()->code_stubs()->Increment();
 
-  // Nested stubs are not allowed for leafs.
-  AllowStubCallsScope allow_scope(masm, AllowsStubCalls());
+  // 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);
   Generate(masm);
 }
 
 
 SmartArrayPointer<const char> CodeStub::GetName() {
   char buffer[100];
   NoAllocationStringAllocator allocator(buffer,
                                         static_cast<unsigned>(sizeof(buffer)));
   StringStream stream(&allocator);
   PrintName(&stream);
@@ skipping 326 matching lines @@
 }
 
 
 bool ToBooleanStub::Types::CanBeUndetectable() const {
   return Contains(ToBooleanStub::SPEC_OBJECT)
       || Contains(ToBooleanStub::STRING);
 }
 
 
 } }  // namespace v8::internal