message: Add is abstract/synthetic helpers to DexMethod
  Summary:
  We use `dex.py` as a library in a different context. In some cases we
  filter out abstract and synthetic methods. It'd be nice to encapsulate the raw
  data access for this in the DexMethod class.
diff: @@ -1260,6 +1260,12 @@ class DexMethod:
  self.insns.append(insn)
  return self.insns
  + def is_abstract(self):
  + return (self.encoded_method.access_flags & ACC_ABSTRACT) != 0
  +
  + def is_synthetic(self):
  + return (self.encoded_method.access_flags & ACC_SYNTHETIC) != 0
  +
  def dump(self, dump_code=True, dump_debug_info=True, f=sys.stdout):
  if self.is_virtual:
  method_type = 'virtual'
  