RFR (T): 8241852: Cleanup error message generation in LinkResolver::resolve_field

[Claes Redestad]

Hi,

a couple of places in LinkResolver::resolve_field where we allocate
ResourceMark and stringStream in a wider scope than necessary. Narrowing
down the scope where they are declared in a similar way as done
consistently in all other places in LinkResolver is a small and trivial
optimization:

http://cr.openjdk.java.net/~redestad/8241852/open.00/

Thanks!

/Claes