[AST] Enable AST node introspection on WIN32
This has broken our 2 stage Windows on Arm build: https://lab.llvm.org/buildbot/#/builders/120/builds/544
I think because we're doing some kind of x86/aarch64 cross compiling kinda setup and the clang-ast-dump produced doesn't like to run in the env we build in. (turns out that WIN32 is also set on Windows 64 bit)
Just an FYI to anyone else, I'll see what we're doing and why the cross compiling follow up change didn't apply here.
Turns out we aren't cross compiling and now it's green again.
Seems like a codegen issue and I have isolated it locally so I might be able to track it down. In any case, all good now from our point of view.