[llvm] [lldb][bazel] Add Windows cross-compilation support to LLDB Bazel overlay (PR #201173)

[David Zbarsky via llvm-commits]

dzbarsky wrote:

I can help test this later today to make sure it compiles with our toolchain. One note - we probably want to condition on the compiler (msvc) not on OS windows. Otherwise clang-cl will not work properly. On the run now but will drop more notes in a bit!

https://github.com/llvm/llvm-project/pull/201173