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When AttrByteSize is not present for a type, we can still determine the
size in two more cases: when the type is a Typedef referring to another
type, and when the type is a pointer and we know the default address
size.

entry.go: return after setting an error if the offset is out of range.

Change-Id: I63a922ca4e4ad2fc9e9be3e5b47f59fae7d0eb5c
Reviewed-on: https://go-review.googlesource.com/9663

Reviewed-by: Austin Clements <austin@google.com>