Possibilities of enabling other CFI schemes

[qua3k]

Hello chromium-dev@, security-dev@!

While I was looking through the tree, I noticed that while the cfi-vcall and cfi-icall schemes instrumenting virtual calls and indirect calls respectively, there was no mention of enabling the other schemes (cfi-nvcall, cfi-mfcall) which ensure that non-virtual calls take place using an object of the correct dynamic type, etc.

I have been unable to find previous discussion on these topics, so I am asking now. Thanks.