[update_cc_test_checks] Default to --function-signature for new tests

[arichardson]

Summary

This is the same as D140212 just for the clang update script. Quite a
bit of churn in the internal tests since they used inputs without the
autogenerated by args.

Depends on D140212

[jdoerfert]

I don't understand why we would remove the flag for _cc_. I feel all these patches are going exactly in the opposite direction I would think one would go.

[arsenm]

clang/test/utils/update_cc_test_checks/Inputs/basic-cplusplus.cpp.expected

3

Why do we still have generated tests using -no-opaque-pointers? Surely that's the lowest hanging fruit?

[arichardson]

In D140218#4001835, @jdoerfert wrote:

I don't understand why we would remove the flag for _cc_. I feel all these patches are going exactly in the opposite direction I would think one would go.

The flag is not being removed it's just inside common.py now (see D140212) and defaults to on for new tests without the auto-generated note.

clang/test/utils/update_cc_test_checks/Inputs/basic-cplusplus.cpp.expected

3

Good question, I can update this as a separate NFC change on Monday.