Groundwork for better tracking of renderscript allocations and scripts

This patch adds some of the groundwork required for tracking the lifetime of scripts and allocations and collecting data associated with them during execution.
Committed on behalf of Aidan Dodds.

Authored by: ADodds
Reviewed by: clayborg, jingham
Subscribers: lldb-commits
Differential Revision: http://reviews.llvm.org/D12936

llvm-svn: 248149