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Revert 741978d727 and things that landed on top of it.

Authored by thakis on Dec 23 2020, 9:39 AM.

Description

Revert 741978d727 and things that landed on top of it.

741978d727 made clang produce output that's 2x as large at least in
sanitizer builds. https://reviews.llvm.org/D83892#2470185 has a
standalone repro.

This reverts the following commits:

Revert "[clang][cli] Port CodeGenOpts simple string flags to new option parsing system"
This reverts commit 95d3cc67caac04668ef808f65c30ced60ed14f5d.

Revert "[clang][cli] Port LangOpts simple string based options to new option parsing system"
This reverts commit aec2991d083a9c5b92f94d84a7b3a7bbed405af8.

Revert "[clang][cli] Streamline MarshallingInfoFlag description"
This reverts commit 27b7d646886d499c70dec3481dfc3c82dfc43dd7.

Revert "[clang][cli] Port LangOpts option flags to new option parsing system"
This reverts commit 383778e2171b4993f555433745466e211e713548.

Revert "[clang][cli] Port CodeGen option flags to new option parsing system"
This reverts commit 741978d727a445fa279d5952a86ea634adb7dc52.