from  Benoît Perrot  <benoit@lrde.epita.fr>

	Hide the text section loaded in virtual machine's memory.

	* src/vm/mmu.hh (inst_has_label, inst_get_offset): Remove.
	* src/vm/virtual_machine.hh (has_label, get_offset): Remove.
	(add_breakpoint) Wait for an offset instead of a label.
	* src/vm/virtual_machine.cc: Update accordingly, move label
	translation into...
	* src/shell/shell.cc (do_break): ...this method.