Fix loading of cdex files.

If the shared data section is not explicitly provided, we must pass
nullptr to OpenCommon, which will in turn infer it from the header.

Bug: 72520014
Test: m test-art-host-gtest
Test: testrunner.py --host
Change-Id: I3eab0f68ff379f8d407f4bb00704ea54d5ae3452
1 file changed