[clang] [C++20] [Modules] [Driver] Don't enable -fdelayed-template-parsing by default on windows with C++20 modules (PR #69431)

[David Blaikie via cfe-commits]

dwblaikie wrote:

Does MSVC have the delayed template parsing effects when using modules? If not, perhaps we should just disable the flag/not allow it to be composed together?

https://github.com/llvm/llvm-project/pull/69431