[clang] [DebugInfo] Add flag to only emit referenced member functions (PR #87018)

[Paul T Robinson via cfe-commits]

pogo59 wrote:

Thanks for the link back to the Phab review, that was helpful. I didn't offhand recall the previous round of this. I'll trust the comments I made on that review. :)

s/members/methods/ in the option name to avoid the incorrect implication of suppressing data members?

I suggest _not_ omitting methods when generating type sections. If there's only one description (in the final executable) it ought to be complete. If you omit undefined methods, and the linker picks the section from a CU with no method definitions, you end up with a type description that has no methods at all, which is not especially useful.

https://github.com/llvm/llvm-project/pull/87018