8170737: Not enough old space utilisation Reviewed-by: dfazunen, tschatzl

8144484: assert(no_dead_loop) failed: dead loop detected Summary: Bailout early without splitting Phi through memory merges if TOP inputs present for Phi Nodes Reviewed-by: thartmann, kvn

8173699: Crash during deoptimization with "assert(result == __null || result->is_oop()) failed: must be oop" Summary: Ignore return_oop() when dispatching an exception and only try to retrieve the oop when performing re-allocation during a normal deoptimization (if exec_mode == Unpack_deopt). Reviewed-by: kvn, vlivanov

Merge