[9] RFR (XXS): 8059556: C2: crash while inlining MethodHandle invocation w/ null receiver

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8059556/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8059556

In case a receiver == null and it is a compile-time constant, it's type 
is TypePtr::NULL_PTR and it is not an oop pointer. Hence, receiver_type 
== NULL. There's no purpose in computing speculative_receiver_type in 
such case.

Make the code in agreement with the similar speculative code in 
Parse::do_call().

Testing: regression test

Thanks!

Best regards,
Vladimir Ivanov