TEB field isolation dcontext fields should be inside unprotected_context_t

From bruen...@google.com on April 13, 2012 11:06:26

b/c the TEB fields are written from the cache, they should be inside unprotected_context_t for SELFPROT_DCONTEXT

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=733