ART: Fix computation of frame size for direct proxy methods

Proxy method has only one direct method and it is a constructor which
is cloned from java.lang.reflect.Proxy class together with code.
As a result its body is a compiled quick code and frame size should be
computed accordingly in contrast with other virtual methods which are
invoked through stub.

Change-Id: I0ac99b2f567b281c9342152bad1149dd6cd39480
Signed-off-by: Serguei Katkov <serguei.i.katkov@intel.com>