LoongArch: Add LA664 support.

LoongArch: Add LA664 support.

Define ISA_BASE_LA64V110, which represents the base instruction set defined in LoongArch1.1.
Support the configure setting --with-arch =la664, and support -march=la664,-mtune=la664.

gcc/ChangeLog:

	* config.gcc: Support LA664.
	* config/loongarch/genopts/loongarch-strings: Likewise.
	* config/loongarch/genopts/loongarch.opt.in: Likewise.
	* config/loongarch/loongarch-cpu.cc (fill_native_cpu_config): Likewise.
	* config/loongarch/loongarch-def.c: Likewise.
	* config/loongarch/loongarch-def.h (N_ISA_BASE_TYPES): Likewise.
	(ISA_BASE_LA64V110): Define macro.
	(N_ARCH_TYPES): Update value.
	(N_TUNE_TYPES): Update value.
	(CPU_LA664): New macro.
	* config/loongarch/loongarch-opts.cc (isa_default_abi): Likewise.
	(isa_base_compat_p): Likewise.
	* config/loongarch/loongarch-opts.h (TARGET_64BIT): This parameter is enabled
	when la_target.isa.base is equal to ISA_BASE_LA64V100 or ISA_BASE_LA64V110.
	(TARGET_uARCH_LA664): Define macro.
	* config/loongarch/loongarch-str.h (STR_CPU_LA664): Likewise.
	* config/loongarch/loongarch.cc (loongarch_cpu_sched_reassociation_width):
	Add LA664 support.
	* config/loongarch/loongarch.opt: Regenerate.