[llvm] [RISCV] Collect function features in AsmPrinter before emission (#76231) (PR #76437)

[Andreu Carminati via llvm-commits]

andcarminati wrote:

> Another case to consider. There could be a function that used the target attribute that enables an extension that is incompatible with the ELF attributes from other pre-compiled object files that the linker will include in the LTO build like libgcc, libc, compiler-rt etc. Will the linker be able to resolve the conflict when it creates the the final ELF attributes for the exe?

I'm taking a look at the mapping symbols problem before proceeding wit this fix.

https://github.com/llvm/llvm-project/pull/76437