PR binutils/10924

    PR binutils/10924
        * config/tc-arm.c (do_ldstv4): Do not allow r15 as the destination
        register.
        (do_mrs): Likewise.
        (do_mul): Likewise.

        * arm-dis.c: Add support for %<>ru and %<>rU formats to enforce
        unique register numbers.  Extend support for %<>R format to
        thumb32 and coprocessor instructions.

        * gas/arm/unpredictable.s: Add more unpredictable instructions.
        * gas/arm/unpredictable.d: Add expected disassemblies.