Request for reviews (L): 6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)

[Christian Thalinger]

This patch is one of the first ones:

http://cr.openjdk.java.net/~twisti/6893081/webrev.01/

It depends on a mlvm patch called meth.walker.patch, which may be sent
out tomorrow (or the day after).

-- Christian