[clang] [SYCL][SPIR-V][Windows] Extend BaseSPIRTargetInfo host-adaptation for Windows support (PR #208196)

[Nick Sarnie via cfe-commits]

https://github.com/sarnex approved this pull request.

nothing jumped out to me but i'm going to heavily defer to Tom on this one

https://github.com/llvm/llvm-project/pull/208196