ART: Detached blocks should not be processed by compiler

It is possible for blocks to be detached. This means that 'successor_block_info->block'
may evaluate to 'NullBasicBlockId'  The code should detect this case and handle it
appropriately.

Signed-off-by: vladimir.a.ivanov <vladimir.a.ivanov@intel.com
Signed-off-by: Niranjan Kumar <niranjan.kumar@intel.com
Change-Id: I410059cd2cbda342cc1380050c0972fcaa2b7a8e
1 file changed