Move data used by the fast-path implementations into a substructure of
MessageInfo and initialize it separately.
Change-Id: Ib855ee8ea5cb0379528b52ba0e191319aa5e2dff
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/184077
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
This currently returns uninformative errors from the fast path and then
consults the slow, reflection-based path only when an error is detected.
Perhaps it's worth going through the effort of producing better errors
directly on the fast path.
Change-Id: I68536e9438010dbd97dbaff4f47b78430221d94b
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/171462
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>