tree c4d2eb4baa8278028eac6103a039b68a4f764341
parent 31e73db6b715e218725b5ca0570a63d3e5f85bf8
author Ben Vanik <benvanik@google.com> 1604698821 -0800
committer Ben Vanik <benvanik@google.com> 1605660656 -0800

Reworking LLVM AOT linking to pick a linker tool based on target env.
This adds the WindowsLinkerTool that uses lld-link or link to generate
the DLLs/PDBs. The existing behavior is modeled in UnixLinkerTool that
is meant for use with ld/ld.lld.

TODOs are in place for mac mach-o and wasm linking, and the UnixLinkerTool
could use a lot of work (left for someone who knows more about ld).