[PATCH 6/14][AArch64] Restore gimple_folding of reduction intrinsics

[Alan Lawrence]

This gives us back the constant-folding of the neon-intrinsics that was removed 
in the first patch, but is now OK for bigendian too.

bootstrapped on aarch64-none-linux-gnu.
check-gcc on aarch64-none-elf and aarch64_be-none-elf.

gcc/ChangeLog:

	* config/aarch64/aarch64.c (TARGET_GIMPLE_FOLD_BUILTIN): Define again.
	* config/aarch64/aarch64-builtins.c (aarch64_gimple_fold_builtin):
	Restore, enable for bigendian, update to use __builtin..._scal...
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