Update RS driver to support extraction of global variable properties.

Bug: 20306487

This patch adds some new enums to classify properties (such as "static",
"constant", and "pointer") for global variables. The reference driver
is also extended to provide methods to examine these properties (when
the bitcode is compiled with bcc).

Change-Id: I331756f8a8990caf5ebdf85599060434a7cfdcb7
6 files changed