ipa-sra: Do not bail out when callers cannot be cloned

ipa-sra: Do not bail out when callers cannot be cloned

IPA-SRA fails to produce (very simple) edge summaries when a caller
cannot be cloned or its signature cannot be changed which makes it
less powerful for no good reason.  This patch fixes that problem.

gcc/ChangeLog:

2021-04-12  Martin Jambor  <mjambor@suse.cz>

	* ipa-sra.c (ipa_sra_dump_all_summaries): Dump edge summaries even
	when there is no function summary.
	(ipa_sra_summarize_function): produce edge summaries even when
	bailing out early.

gcc/testsuite/ChangeLog:

2021-04-12  Martin Jambor  <mjambor@suse.cz>

	* gcc.dg/ipa/ipa-sra-1.c (main): Revert change done by
	05193687dde, make the argv again pointer to an array.