Windows toolchain - swiftToCxx directory missing

[litewrap]

Description
swiftToCxx directory is missing in the Swift Windows toolchain

Steps to reproduce

Directory: C:\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain\usr\lib\swift


Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
d-----          2/3/2023   9:09 AM                migrator
d-----          2/3/2023   9:09 AM                pm

Expected behavior

\usr\lib\swift must include the swiftToCxx directory and the content include the following header files:
_SwiftCxxInteroperability.h
_SwiftStdlibCxxOverlay.h

[AnthonyLatsis]

Please include the Swift version.

[hyp]

@compnerd do you by any chance know why /usr/lib/swift doesn't include a lot of things on Windows?

[compnerd]

@hyp the answer is two folds:

1. Separation between toolchain and SDK.

The content in the toolchain should be target agnostic.

2. People add things without testing on windows.

There is an explicit list of things that are packaged for distribution. That lives in the installer sources at sdk-amd64 and runtime-amd64 for X64, with variants for X86, ARM64, and ARMv7.

[litewrap]

@AnthonyLatsis

All Swift versions, including the 5.8 and latest snapshot

[hyp]

@compnerd let me know if you'll be able to look at this. I will assign it to you for now, but feel free to send it back to me if you think you won't have bandwidth.