ART: Refactor try/catch block info, store exception type

This patch replaces HBasicBlock fields storing try/catch info with a
single TryCatchInformation data structure, saving memory for the
majority of non-try/catch blocks. It also changes builder to store
the exception type for catch blocks.

Change-Id: Ib3e43f7db247e6915d67c267fc62410420e230c9