[LLD][PowerPC] Add support for R_PPC64_TPREL34 used in TLS Local Exec
Add Thread Local Storage Local Exec support to LLD. This is to support PC Relative addressing of Local Exec.
The patch teaches LLD to handle:
paddi r9, r13, x1@tprel
The relocation is:
Reviewed By: NeHuang, MaskRay
Differential Revision: https://reviews.llvm.org/D86608