Merge branch 'android-3.18' into android-goldfish-3.18

ba85515984f6 Merge 3.18.94 into android-3.18
22c24eea301b ANDROID: qtaguid: Fix the UAF probelm with tag_ref_tree
cde3537bd109 Linux 3.18.94
6e0432e6d084 UPSTREAM: arm64: mm: keep reserved ASIDs in sync with mm after multiple rollovers
1ee4be715741 UPSTREAM: arm64: factor out entry stack manipulation
e0c5ba8cd917 UPSTREAM: arm64: tlbflush.h: add __tlbi() macro

Change-Id: I1ee385bf0f43d889842f6f631f6db987dc488a45