Request for reviews (XS): 6986944: JSR 292 assert(caller_nm->is_method_handle_return(caller_frame.pc())) failed: must be MH call site

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6986944/webrev.01/

6986944: JSR 292 assert(caller_nm->is_method_handle_return(caller_frame.pc())) failed: must be MH call site
Reviewed-by:

The problem is that C1 calls ciMethod::is_method_handle_invoke in
LIRGenerator::do_Invoke. When the target is not loaded yet but is a
MH call site, the method returns false and it's not registered as a MH
invoke.

The fix is to restore the old logic, but only on the non-loaded path.

Tested with MethodHandlesTest.

This change also includes a build fix for newer GCCs.