Bump oat version due to InstructionSet enum renumbering in change:

commit ed8dd492
Author: Serban Constantinescu <serban.constantinescu@arm.com>
Date:   Tue Feb 11 14:15:10 2014 +0000

    AArch64: Add ARM64 Assembler

    This patch adds the ARM64 Assembler and ManagedRegister backend.
    The implementation of the Arm64Assembler class is based on VIXL (a
    programmatic A64 Assembler - see external/vixl ).

    Change-Id: I842fd574637a953c19631eedf26f6c70d9ed7f9e
    Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>

Change-Id: I9e689b0a3586d996135f2c12265704ee139c9e4f