[Reland][Reland][DWARFLinkerParallel] Add limited functionality to DWARFLinkerParallel.

This patch is extracted from D96035, it adds support for the existing
DWARFLinker functionality. What is not supported yet:

1. Types deduplication(--odr mode).
2. Modules deduplication.
3. Generation of index tables.

Reland2: temporarily disabled call to "--linker llvm" for tls-variable.test
and location-expression.test as it does not work properly on bigendian
architecture.

Differential Revision: https://reviews.llvm.org/D153268