Fixes for "null instanceof" and class initialization

First issue was that the codegen seemed to expect r0 to contain 0 for
a false result in the null object case. This is a quick fix to make
that true. Given that the code is doing the work of a null check and
pulling out the object's class, the code should probably just pass the
class to the helper function, making this a case of IsAssignableFrom,
not instanceof.

Second issues were related to missing EnsureInitialized calls in two
different code paths, one coming from reflection, one coming from
managed code. New Class::AllocObject assert should help keep us out of
trouble in the future in this area, although perhaps Heap::AllocObject
should have a check as well.

Change-Id: Ib7975b6457481c1ac85135d38f42c6061e6443a0
13 files changed
tree: f76c0593d7be5975543411a3d85134e846774ba5
  2. build/
  3. oat_process/
  4. oat_runtime/
  5. src/
  6. test/
  7. tools/