testsuite: Cleanup after auto-profile testcases when auto-profile is not supported...

testsuite: Cleanup after auto-profile testcases when auto-profile is not supported [PR121215]

The problem here is that in tree-prof.exp does not cleanup if requiring auto-profile
but it is not supported and the testcase uses dg-additional-sources. Currently additional_sources
is not reset to "" and then another testcase comes along and thinks that is the additional source
to be added.

Committed as obvious after testing:
make check-gcc RUNTESTFLAGS="tree-prof.exp=afdo-crossmodule-1.c tree-ssa.exp=pr67891.c"
to make sure pr67891.c now no longer uses the additional source.

	PR testsuite/121215
gcc/testsuite/ChangeLog:

	* lib/profopt.exp (profopt-execute): Call cleanup-after-saved-dg-test
	if returning early for the -fauto-profile case failing case.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>