[clang] [clang] Fix PS "selective" DLL import/export of vtable & typeinfo (PR #92579)

[Paul T Robinson via cfe-commits]

https://github.com/pogo59 commented:

I am moderately sure this does what we (Sony) want, but I would like a second set of eyes on it so I'm not marking it approved.

https://github.com/llvm/llvm-project/pull/92579