As a reminder, UTC_ARGS is used by lit test cases to specify which
arguments need to be passed to update_XXXX_test_checks.py to be
auto-updated properly.
The support is achieved by relying on common.itertests, which is what
other test
updaters use to iterate over test files.
This commit also changes how the --llc-binary option is saved in args.
It used to be saved as "llc", but it is here changed to the standard
"llc_binary" to make use of an existing ignore mechanism for specific
arguments. Without that change, the option would not be ignored and
would appear in UTC_ARGS. This would be different from what e.g.
update_llc_test_checks does. As update_mir_test_checks.py now supports
UTC_ARGS, it became important to ensure the option is ignored.
Differential Revision: https://reviews.llvm.org/D135580
Generation of CHECK lines for fixedStack can be enabled with --print-fixed-stack.
This is particularly useful for tests which need to inspect how the
stack looks, e.g. for ABI tests.
See the other stacked revision building on top of this one which enables UTC_ARGS (in a similar fashion to other test updaters in utils/).
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D135579
