Bug: http://b/26781196 Bug: http://b/25884483 Bug: http://b/26432628 Although this issue was first only manifesting on Fugu, it now affects N9 and N6p as well. This change disables unsigned overflow sanitization on all platforms. The real fix for libc++ (r257368) can't be committed until we have updated Clang at least one more time. Change-Id: I71e9c50d25ae4566d4c06f348183c4b22a4bb60a