[clang] [llvm] [CodeGen][COFF] Always emit CodeView compiler info on Windows targets (PR #142970)

[Jacek Caban via llvm-commits]

cjacek wrote:

The new version always emits `S_OBJNAME` and `S_COMPILE3` on Windows targets, regardless of debug info settings. It no longer depends on #142969. On the Clang side, it emits only minimal compiler info in IR when full debug info is not enabled.

I wasn't sure whether to enable this for UEFI targets as well, so I didn't. I enabled it for MinGW targets too, since I saw no reason to treat them differently.

https://github.com/llvm/llvm-project/pull/142970