Use bundled llc/opt on Windows
Motivation
Since Windows bindist for GHC 9.4+ comes with llc.exe
/opt.exe
, GHC should use them by default.
Proposal
lib/settings
should contain something like:
,("LLVM llc command", "$tooldir/mingw/bin/llc.exe")
,("LLVM opt command", "$tooldir/mingw/bin/opt.exe")