Make const_1_mode print $1 in AT&T syntax

Make const_1_mode print $1 in AT&T syntax

Make const_1_mode print $1 in AT&T syntax, otherwise
there will be correctness issues when it is extended
to support APX NDD,

gas/ChangeLog:

        * testsuite/gas/i386/intel.d: Adjust testcase.
        * testsuite/gas/i386/lfence-load.d: Ditto.
        * testsuite/gas/i386/noreg16-data32.d: Ditto.
        * testsuite/gas/i386/noreg16.d: Ditto.
        * testsuite/gas/i386/noreg32-data16.d: Ditto.
        * testsuite/gas/i386/noreg32.d: Ditto.
        * testsuite/gas/i386/noreg64-data16.d: Ditto.
        * testsuite/gas/i386/noreg64-rex64.d: Ditto.
        * testsuite/gas/i386/noreg64.d: Ditto.
        * testsuite/gas/i386/opcode-suffix.d: Ditto.
        * testsuite/gas/i386/opcode.d: Ditto.
        * testsuite/gas/i386/x86-64-lfence-load.d: Ditto.
        * testsuite/gas/i386/x86-64-opcode.d: Ditto.

opcodes/ChangeLog:

        * i386-dis.c (OP_I): Make const_1_mode print $1 in AT&T syntax.