aarch64: Fix transitive closure of features

aarch64: Fix transitive closure of features

aarch64-option-extensions.def requires us to maintain the transitive
closure of options by hand.  This patch fixes a few cases where a
flag was missed.

+noaes and +nosha2 now disable +crypto, which IMO makes more
sense and is consistent with the Clang behaviour.

gcc/
	* config/aarch64/aarch64-option-extensions.def (dotprod): Depend
	on fp as well as simd.
	(sha3): Likewise.
	(aes): Likewise.  Make +noaes disable crypto.
	(sha2): Likewise +nosha2.  Also make +nosha2 disable sha3 and
	sve2-sha3.
	(sve2-sha3): Depend on sha2 as well as sha3.

gcc/testsuite/
	* gcc.target/aarch64/options_set_6.c: Expect +crypto+nosha2 to
	disable crypto but keep aes.
	* gcc.target/aarch64/pragma_cpp_predefs_4.c: New test.