ipa: Compare jump functions in ICF (PR 113907)

ipa: Compare jump functions in ICF (PR 113907)

In PR 113907 comment #58, Honza found a case where ICF thinks bodies
of functions are equivalent but becaise of difference in aliases in a
memory access, different aggregate jump functions are associated with
supposedly equivalent call statements.  This patch adds a way to
compare jump functions and plugs it into ICF to avoid the issue.

gcc/ChangeLog:

2024-03-20  Martin Jambor  <mjambor@suse.cz>

	PR ipa/113907
	* ipa-prop.h (class ipa_vr): Declare new overload of a member function
	equal_p.
	(ipa_jump_functions_equivalent_p): Declare.
	* ipa-prop.cc (ipa_vr::equal_p): New function.
	(ipa_agg_pass_through_jf_equivalent_p): Likewise.
	(ipa_agg_jump_functions_equivalent_p): Likewise.
	(ipa_jump_functions_equivalent_p): Likewise.
	* ipa-cp.h (values_equal_for_ipcp_p): Declare.
	* ipa-cp.cc (values_equal_for_ipcp_p): Make function public.
	* ipa-icf-gimple.cc: Include alloc-pool.h, symbol-summary.h, sreal.h,
	ipa-cp.h and ipa-prop.h.
	(func_checker::compare_gimple_call): Comapre jump functions.

gcc/testsuite/ChangeLog:

2024-03-20  Martin Jambor  <mjambor@suse.cz>

	PR ipa/113907
	* gcc.dg/lto/pr113907_0.c: New.
	* gcc.dg/lto/pr113907_1.c: Likewise.
	* gcc.dg/lto/pr113907_2.c: Likewise.