This past reliance doesn't work well with Swift, and the sources
were trying to over hand optimize to minimize rebuilds, and that
likely isn't worth the trouble, so explicit imports.
The remaining places that still use them are where they are
needed within the header to deal with relationships between
the local definitions or where there is a cycle between the
headers and it allows either one to be imported first and still
get a complete definition in the using context.
PiperOrigin-RevId: 671379912
- Minor formatting changes to make thing happy.
- Block clang-format from the PDDM macro definitions to avoid it wrapping
things.
- Don't add clang-format directives to the expansion, easier to handling
it outside of there.