re PR tree-optimization/43220 (Paritially optimized __builtin_save_stack/__builtin_restore_stack causes segmentation fault)

2010-03-01  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/43220
	* tree-ssa-ccp.c (optimize_stack_restore): Do not optimize
	BUILT_IN_STACK_{SAVE,RESTORE} around alloca.

	* gcc.c-torture/execute/pr43220.c: New testcase.

From-SVN: r157149