This patch adds support for TLS variables to the XCOFF object writer:
- Add TData and TBSS sections
- Add CsectGroups for the mapping classes XCOFF::XMC_TL and XCOFF::XMC_UL
- Add XMC_UL in the enum entry of CsectStorageMapping class to print the string
while reading the symbol properties for TLS variables
- Fix the starting address of TData and TBSS sections
Reviewed by: hubert.reinterpretcast, DiggerLin
Differential Revision: https://reviews.llvm.org/D98946
Victor Huang