Fixes a couple problems with GC of unoptimized code.

runtime/vm/code_patcher.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Class for patching compiled code.
 
 #ifndef VM_CODE_PATCHER_H_
 #define VM_CODE_PATCHER_H_
 
 #include "vm/allocation.h"
 
@@ skipping 24 matching lines @@
   static void PatchInstanceCallAt(uword return_address,
                                   const Code& code,
                                   uword new_target_address);
 
   // Patch entry point with a jump as specified in the code's patch region.
   static void PatchEntry(const Code& code);
 
   // Restore entry point with original code (i.e., before patching).
   static void RestoreEntry(const Code& code);
 
-  // Returns true if the code can be patched with a jump at beginnning (checks
+  // Returns true if the code can be patched with a jump at beginning (checks
   // that there are no conflicts with object pointers). Used in ASSERTs.
   static bool CodeIsPatchable(const Code& code);
 
   // Return the target address of the static call before return_address
   // in given code.
   static uword GetStaticCallTargetAt(uword return_address, const Code& code);
 
   // Get instance call information.  Returns the call target and sets each
   // of the output parameters ic_data and arguments_descriptor if they are
   // non-NULL.
@@ skipping 15 matching lines @@
   static intptr_t InstanceCallSizeInBytes();
 
   static void InsertCallAt(uword start, uword target);
 
   static RawObject* GetEdgeCounterAt(uword pc, const Code& code);
 };
 
 }  // namespace dart
 
 #endif  // VM_CODE_PATCHER_H_