2013-03-12  Yao Qi  <yao@codesourcery.com>
	    Hui Zhu  <hui@codesourcery.com>

	* dwarf2loc.c (access_memory): Change nbits to nbytes in gdb_assert.
	(dwarf2_compile_expr_to_ax): Call access_memory in DW_OP_deref and
	DW_OP_deref_size.