testsuite: Fix guality/ipa-sra-1.c to work with return IPA-VRP

The test guality/ipa-sra-1.c stopped working after
r14-5628-g53ba8d669550d3 because the variable from which the values of
removed parameters could be calculated is also removed with it.  Fixed
with this patch which stops a function from returning a constant.

I have also noticed that the XFAILed test passes at -O0 -O1 and -Og on
all (three) targets I have tried, not just aarch64, so I extended the
xfail exception accordingly.

gcc/testsuite/ChangeLog:

2024-02-14  Martin Jambor  <mjambor@suse.cz>

	* gcc.dg/guality/ipa-sra-1.c (get_val1): Move up in the file.
	(get_val2): Likewise.
	(bar): Do not return a constant.  Extend xfail exception for all
	targets.