[lld] [llvm] [NFCI][LTO][lld] Optimize away symbol copies within LTO global resolution in ELF (PR #106193)

[Mingming Liu via llvm-commits]

minglotus-6 wrote:

Reverted the change in https://github.com/llvm/llvm-project/commit/1cc4c87198ec0c6febca3f6ed03357e9e091cfd4 and working on a fix (to store the saved StringRef in `lto::InputFile::Symbol` so it remains alive when lto global resolution happens, as opposed to merely save the StringRef of `lto::InputFile::Symbol` in unique string saver )

https://github.com/llvm/llvm-project/pull/106193