Revert "Revert back to the old LLVM PassManager"
Revert "Revert back to the old LLVM PassManager"

This reverts commit 09008125e7944ae01bb907f2eb8dbff41d7a0715.

zig-lang/zig,andrewrk/zig,zig-lang/zig,andrewrk/zig,zig-lang/zig