[llvm] [Orc] Initial version of ELFSymtabStaticGenerator (PR #135591)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Agreed. Should just use .dynsym , which cannot be stripped by llvm-strip/GNU strip.
(Additionally, `/proc/self/exe` works on Linux but probably not other ELF OSes)

https://github.com/llvm/llvm-project/pull/135591