Created by: toshipiazza
Enables global auto-predication as part of drmgr's insertion event. Also modifies instrace and memtrace samples to do the right thing with respect to predication during memref tracing vs instruction tracing.
drreg does not interact well with other drmgr passes, as well as main client passes when auto-predication is enabled. We disable auto-predication for all drreg passes.
drmemtrace is non-trivial to add auto-predication to. We globally disable auto-predication for drmemtrace.
Fixes #1723 (closed)