[Sparc] invalid adjustments in TLS_LE/TLS_LDO relocations removed

Summary:
Some SPARC TLS relocations were applying nontrivial adjustments
to zero value, leading to unexpected non-zero values in ELF and then
Solaris linker failures.

Getting rid of these adjustments.

Fixes PR33825.

Reviewers: rafael, asb, jyknight

Subscribers: joerg, jyknight, llvm-commits

Differential Revision: https://reviews.llvm.org/D35567

llvm-svn: 308978