[PATCH] Introduce libLTO C APIs to target the "resolution-based" new LTO API

[Mehdi Amini via llvm-commits]

Hi,

Phabricator does not send email, so I do it manually. The review is online here: https://reviews.llvm.org/D31898 <https://reviews.llvm.org/D31898> ; and the patch is attached.

Summary:
The goal is to deprecate the existing C API exposed by libLTO and
remove it 2 or 3 releases from now.
This commit introduces the basic replacement APIs, and it not intended
to be a complete replacement at this point.

A new tool is introduced: `llvm-liblto`. This tool links statically
only to libSupport, and link dynamically to libLTO. It offers a way
to test the new C API in tree without having a linker using this API
available. This was a major painpoint of the existing API.

This is a work-in-progress, I'm sharing it now to show the general
direction I took until now.





— 
Mehdi

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