Fix inliner ICE on alias with flatten attribute [PR92372]
gcc/ChangeLog:
2020-03-19 Jan Hubicka <hubicka@ucw.cz>
PR ipa/92372
* cgraphunit.c (process_function_and_variable_attributes): warn
for flatten attribute on alias.
* ipa-inline.c (ipa_inline): Do not ICE on flatten attribute on alias.
gcc/testsuite/ChangeLog:
2020-03-19 Jan Hubicka <hubicka@ucw.cz>
PR ipa/92372
* gcc.c-torture/pr92372.c: New test.
* gcc.dg/attr-flatten-1.c: New test.