[BOLT] Preserve original LSDA type encoding

[BOLT] Preserve original LSDA type encoding

In non-pie binaries BOLT unconditionally converted type encoding
from indirect to absptr, which broke std exceptions since pointers
to their typeinfo were only assigned at runtime in .data section.
In this patch we preserve original encoding so that indirect
remains indirect and can be resolved at runtime, and absolute remains absolute.

Reviewed By: rafauler, maksfb

Differential Revision: https://reviews.llvm.org/D132484