Request for reviews (M): 6990192: VM crashes in ciTypeFlow::get_block_for()

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6990192/webrev.01/

6990192: VM crashes in ciTypeFlow::get_block_for()
Reviewed-by:

In SystemDictionary::find_method_handle_invoke when the classes of the
signature are not on the bootclasspath the method always returns the
newly created method resulting in an assert in
ConstantPoolCacheEntry::set_f1.

The fix is to set the first method coming in into the constant pool
cache.  To avoid races this is done atomically.

Additionally the initialization of the invoke-method table is changed
to be eagerly since initializing it lazily contains another race.

Tested with testcase mentioned in CR.