Replace CpuAMD64/CpuIntel64 with AMD64/Intel64

Replace CpuAMD64/CpuIntel64 with AMD64/Intel64

AMD64 vs CpuIntel64 ISA should be handled similar as AT&T vs Intel
syntax.  Since cpu_flags isn't sorted by position, we need to check
the whole cpu_flags array for the maximum position when verifying
CpuMax.

gas/

	PR gas/20154
	* config/tc-i386.c (cpu_flags_match): Don't set cpuamd64 nor
	cpuintel64.
	(match_template): Check Intel64/AMD64 ISA.

opcodes/

	PR gas/20154
	* i386-gen.c (cpu_flags): Remove CpuAMD64 and CpuIntel64.
	(opcode_modifiers): Add AMD64 and Intel64.
	(main): Properly verify CpuMax.
	* i386-opc.h (CpuAMD64): Removed.
	(CpuIntel64): Likewise.
	(CpuMax): Set to CpuNo64.
	(i386_cpu_flags): Remove cpuamd64 and cpuintel64.
	(AMD64): New.
	(Intel64): Likewise.
	(i386_opcode_modifier): Add amd64 and intel64.
	(i386-opc.tbl): Replace CpuAMD64/CpuIntel64 with AMD64/Intel64
	on call and jmp.
	* i386-init.h: Regenerated.
	* i386-tbl.h: Likewise.