asavonic wrote:

@mysterymath, @ilovepi, @efriedma-quic, thank you for review!

> Generally, I'd like to minimize the amount of code for LTO that's in clang/: 
> we have other frontends that do LTO, and we don't want them to 
> copy-paste/translate a bunch of new code just to make inline asm work the way 
> it's supposed to. Can we refactor this?

Sure! Perhaps we can move `ModuleSymbolTable::CollectAsm*` calls and metadata 
construction to `ModuleSymbolTable` itself? Then Clang or other frontends can 
call `ModuleSymbolTable` to get a constructed metadata, and set it as a flag. 
Or let `ModuleSymbolTable` to update a Module.

> Can you add a RISC-V test? We've had lots of problem w/ target features in 
> LTO w/ RV, and the module level inline asm in particular. To date we've done 
> a few things to try and mitigate that by plumbing them through the backend. 
> I'd like to know how this patch ends up interacting w/ that, and whether this 
> solve some of the remaining issues, or if we need further triage for that 
> backend.
> 
> #50591, #65090, #69780 are all related to some extent.

Yes, I'm going to add a test from #67698 for RISC-V, and check other issues 
that you mentioned. Not all of them are minimal, so I may need some help there.

https://github.com/llvm/llvm-project/pull/174995
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