[ELF] - Fail the link if something happens on DWARF parsing stage of -gdb-index building

[ELF] - Fail the link if something happens on DWARF parsing stage of -gdb-index building

This is relative to PR33173,

Previously if something wrong happened on DWARF parsers side during parsing
object for building gdb index (like was in PR: unsupported relocation)
then LLD continued and finished the link. DWARF parsers sure showed error
message on their side, but that is all.

Patch changes behavior to fail the link in this case and show more
detailed message.

Differential revision: https://reviews.llvm.org/D34814

llvm-svn: 307370