[LLD] Adding support for RELA for CG Profile.

This is a follow up to https://reviews.llvm.org/D104080, and https://github.com/llvm/llvm-project/commit/ca3bdb57fa1ac98b711a735de048c12b5fdd8086#diff-e64a48fabe31db213a631fdc5f2acb51bdddf3f16a8fb2928784f4c579229585. The implementation of  call graph profile was changed from a black box section to relocation approach. This was done to be compatible with post processing tools like strip/objcopy, and llvm equivalent. When they are invoked on object file before the final linking step with this new approach the symbol indices correctness is preserved.

The GNU binutils tools change the REL section to RELA section, unlike llvm tools. For example when strip -S is run on the ELF object files, as an intermediate step before linking. To preserve compatibility this patch extends implementation in LLD and ELFDumper to support both REL and RELA sections for call graph profile.

Reviewed By: MaskRay, jhenderson

Differential Revision: https://reviews.llvm.org/D105217