x86: Add Intel ENCLV to assembler and disassembler
    
    gas/
    
    	* testsuite/gas/i386/se1.s: Add enclv.
    	* testsuite/gas/i386/x86-64-se1.s: Likewise.
    	* testsuite/gas/i386/se1.d: Updated.
    	* testsuite/gas/i386/x86-64-se1.d: Likewise.
    
    opcodes/
    
    	* i386-dis.c (rm_table): Add enclv.
    	* i386-opc.tbl: Add enclv.
    	* i386-tbl.h: Regenerated.
    
    (cherry picked from commit a4e78aa5fed5ba2cc343c76b78d062291a6fb659)