2006-04-25 Frank Ch. Eigler <fche@elastic.org>

2006-04-25  Frank Ch. Eigler  <fche@elastic.org>

	PR 2427.
	* staptree.cxx (varuse_collecting_visitor::visit_embeddedcode):
	Support /* pure */ declaration.  Stop using __tvar_ naming hack.
	(v_c_u::visit_print_format): Mark sprint and sprintf as
	side-effect-free.
	(deep_copy_visitor::visit_print_format): Propagate raw_components.
	* stap.1.in: Document declaration.
	* elaborate.cxx (semantic_pass_opt2): Verbose message tweak.
	(dead_stmtexpr_remover): Extend for more aggressive optimization.
	* tapsets.cxx (dwarf,mark_var_expanding_copy_visotor): Add
	/* pure */ declaration to rvalue expansions.
	* tapset/*.stp: Added /* pure */ declarations to many functions.
	* testsuite/parseok/unparsers.stp: Propagate guru mode flag.
	* testsuite/buildok/twentyfour.stp: New test.