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

[Jacek Caban via llvm-commits]

cjacek wrote:

The new version avoids creating unnecessary labels (and most of `DebugHandlerBase`) by setting `Asm` to null. I also added handling for unknown architecture types in `mapArchToCVCPUType`, which is triggered when running some of the Generic tests on Windows. Additionally, I tweaked a few tests that compare output assembly or IR, as they were failing due to the file name now being encoded.

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