re PR sanitizer/77396 (address sanitizer crashes if all static global variables...

re PR sanitizer/77396 (address  sanitizer crashes if all static global variables are optimized)

	PR sanitizer/77396
	* sanopt.c: Include gimple-ssa.h, tree-phinodes.h and ssa-iterators.h.
	(sanopt_optimize_walker): Optimize away
	__asan_before_dynamic_init (...) followed by
	__asan_after_dynamic_init () without intervening memory loads/stores.
	* ipa-pure-const.c (special_builtin_state): Handle
	BUILT_IN_ASAN_BEFORE_DYNAMIC_INIT and
	BUILT_IN_ASAN_AFTER_DYNAMIC_INIT.

	* decl2.c (do_static_initialization_or_destruction): Only
	call asan_dynamic_init_call if INITP is true.

	* g++.dg/asan/pr77396.C: New test.

From-SVN: r239961