internal/pkgbits: indent productions and hoist some types up

The types being hoisted are those which cannot be referenced; that is,
where Ref[T] is illegal. These are most clearly owned by pkgbits. The
types which follow are those which can be referenced.

Referenceable types are more hazy due to the reference mechanism of UIR
- sections. These are a detail of the UIR file format and are surfaced
directly to importers.

I suspect that pkgbits would benefit from a reference mechanism not
dependent on sections. This would permit us to push down many types
from the noder into pkgbits, reducing the interface surface without
giving up deduplication.

Change-Id: Ifaf5cd9de20c767ad0941413385b308d628aac6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/674635
Auto-Submit: Mark Freeman <mark@golang.org>
TryBot-Bypass: Mark Freeman <mark@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>

0 files changed, 0 insertions, 0 deletions