Support {evex} pseudo prefix for decode evex promoted insns without egpr32.

Support {evex} pseudo prefix for decode evex promoted insns without egpr32.

This patch is based on APX NF patch and also adds test cases for Checking 64-bit insns not sizeable through
register operands with evex.

gas/ChangeLog:

        * testsuite/gas/i386/x86-64-apx-evex-promoted-intel.d: Added no-egpr testcases for movbe.
        * testsuite/gas/i386/x86-64-apx-evex-promoted-wig.d: Ditto.
        * testsuite/gas/i386/x86-64-apx-evex-promoted.d: Ditto.
        * testsuite/gas/i386/x86-64-apx-evex-promoted.s: Ditto.
        * testsuite/gas/i386/x86-64.exp: Added tests.
        * testsuite/gas/i386/noreg64-evex.d: New test.
        * testsuite/gas/i386/noreg64-evex.e: Ditto.
        * testsuite/gas/i386/noreg64-evex.s: Ditto.
        * testsuite/gas/i386/x86-64-apx_f-evex.d: Ditto.
        * testsuite/gas/i386/x86-64-apx_f-evex.s: Ditto.

opcodes/ChangeLog:

        * i386-dis-evex.h: Added %ME to movbe.
        * i386-dis.c : Added %XE to evex_from_vex instructions to output {evex}.
        (struct dis386): New %ME.
        (putop): Handle %ME and output {evex} for evex_from_legacy instructions.
        * Return early when the instruction name is (bad).