[ELF] - Implemented --compress-debug-sections option.

Patch implements --compress-debug-sections=zlib.

In compare with D20211 (a year old patch, abandoned), it implementation
uses streaming and fully reimplemented, does not support zlib-gnu for
simplification.

This is PR32308.

Differential revision: https://reviews.llvm.org/D31941

llvm-svn: 300444