AArch64: Add flags in built-in functions [PR94442]

AArch64: Add flags in built-in functions [PR94442]

2020-07-17  Zhiheng Xie  <xiezhiheng@huawei.com>

gcc/ChangeLog:

	* config/aarch64/aarch64-builtins.c (enum aarch64_type_qualifiers):
	Add new field flags.
	(VAR1): Add new field FLAG in macro.
	(VAR2): Likewise.
	(VAR3): Likewise.
	(VAR4): Likewise.
	(VAR5): Likewise.
	(VAR6): Likewise.
	(VAR7): Likewise.
	(VAR8): Likewise.
	(VAR9): Likewise.
	(VAR10): Likewise.
	(VAR11): Likewise.
	(VAR12): Likewise.
	(VAR13): Likewise.
	(VAR14): Likewise.
	(VAR15): Likewise.
	(VAR16): Likewise.
	(aarch64_general_fold_builtin): Likewise.
	(aarch64_general_gimple_fold_builtin): Likewise.
	* config/aarch64/aarch64-simd-builtins.def: Add default flag for
	each built-in function.
	* config/aarch64/geniterators.sh: Add new field in BUILTIN macro.