re PR middle-end/38503 (warnings from -isystem headers strikes back.)

re PR middle-end/38503 (warnings from -isystem headers strikes back.)

2009-01-27  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/38503
	* cfgexpand.c (expand_gimple_basic_block): Ignore
	GIMPLE_CHANGE_DYNAMIC_TYPE during expansion.
	* tree-ssa-structalias.c (set_uids_in_ptset): Do not prune
	variables that cannot have TBAA applied.
	(compute_points_to_sets): Do not remove GIMPLE_CHANGE_DYNAMIC_TYPE
	statements.

	* g++.dg/warn/Wstrict-aliasing-bogus-placement-new.C: New testcase.

From-SVN: r143700