aarch64: Fix issue with __pld builtin at -O0 [PR 123548]

aarch64: Fix issue with __pld builtin at -O0 [PR 123548]

This fixes the issues with __pld by removing it and related prefetch
instrisics from the arm_acle.h and defines the intrinsics directly.

	PR target/123548

gcc/ChangeLog:

	* config/aarch64/aarch64-builtins.cc
	(aarch64_builtins): Rename AARCH64_PL<X> to
	AARCH64_PREFETCH_PL<X>.
	(aarch64_init_prefetch_builtin): Rename to...
	(aarch64_init_prefetch_builtins): ...this and change builtin
	names.
	(AARCH64_INIT_PREFETCH_BUILTIN): Change to not add
	"__builtin_aarch64__" prefix and to register builtins.
	(handle_arm_acle_h): Add call to aarch64_init_prefetch_builtins.
	(aarch64_init_pcdphint_builtins): Move __pldir code to init
	prefetch builtins.
	(aarch64_general_init_builtins): Remove call to
	aarch64_init_prefetch_builtin.
	(aarch64_expand_prefetch_builtin): Update names of PL<X>
	builtins.`
	* config/aarch64/arm_acle.h
	(__pld): Remove
	(__pli): Likewise.
	(__plix): Likewise.
	(__pldx): Likewise.
	(__pldir): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/pldir.c: Move to...
	* gcc.target/aarch64/acle/pldir.c: ...here.
	* gcc.target/aarch64/builtin_pld_pli_illegal.c: Removed.
	* gcc.target/aarch64/acle/pld_pli_illegal.c: New test.
	* gcc.target/aarch64/builtin_pld_pli.c: Removed.
	* gcc.target/aarch64/acle/pld_pli.c: New test.
	* gcc.target/aarch64/pr123548.c: New test.