RFR: 8217450: Add PackageEntry::locked_lookup_only

[Claes Redestad]

On 2019-01-22 16:11, Aleksey Shipilev wrote:
> Mmm. Compilers might complain we do not use the returned value? I think the previous way made a bit
> more sense, and was a bit faster. Just move the local variable declaration?

Ok - updated http://cr.openjdk.java.net/~redestad/8217450/open.01/ in
place and running some sanity tests before push.

Thanks!

/Claes