i386: Correct adcx suffix in disassembler

i386: Correct adcx suffix in disassembler

Since 0x66 is the opcode prefix for adcx, it is wrong to use the 'S'
prefix:

  'S' => print 'w', 'l' or 'q' if suffix_always is true

on adcx.  Add

  'L' => print 'l' or 'q' if suffix_always is true

replace S with L on adcx and adox.

gas/

	PR binutils/31219
	* testsuite/gas/i386/suffix.d: Updated.
	* testsuite/gas/i386/x86-64-suffix.d: Likewise.
	* testsuite/gas/i386/suffix.s: Add tests for adcx and adox.
	* testsuite/gas/i386/x86-64-suffix.s: Likewise.

opcodes/

	PR binutils/31219
	* i386-dis.c: Add the 'L' suffix.
	(prefix_table): Replace S with L on adcx and adox.
	(putop): Handle the 'L' suffix.