arm: gimple fold aes[ed] [PR114522]

arm: gimple fold aes[ed] [PR114522]

Almost a copy/paste from the recent aarch64 version of this patch,
this one is a bit more intrusive because it also introduces
arm_general_gimple_fold_builtin.

With this patch,
gcc.target/arm/aes_xor_combine.c scan-assembler-not veor
passes again.

gcc/ChangeLog:

	PR target/114522
	* config/arm/arm-builtins.cc (arm_fold_aes_op): New function.
	(arm_general_gimple_fold_builtin): New function.
	* config/arm/arm-builtins.h (arm_general_gimple_fold_builtin): New
	prototype.
	* config/arm/arm.cc (arm_gimple_fold_builtin): Call
	arm_general_gimple_fold_builtin as needed.