ipa/111245 - bogus modref analysis for store in call that might throw

ipa/111245 - bogus modref analysis for store in call that might throw

We currently record a kill for

  *x_4(D) = always_throws ();

because we consider the store always executing since the appropriate
check for whether the stmt could throw is guarded by
!cfun->can_throw_non_call_exceptions.

	PR ipa/111245
	* ipa-modref.cc (modref_access_analysis::analyze_store): Do
	not guard the check of whether the stmt could throw by
	cfun->can_throw_non_call_exceptions.

	* g++.dg/torture/pr111245.C: New testcase.

(cherry picked from commit e6037af6d5e5a43c437257580d75bc8b35a6dcfd)