aarch64: Add 64 bit setter getter fpsr fpcr

aarch64: Add 64 bit setter getter fpsr fpcr

gcc/ChangeLog

	* config/aarch64/aarch64-builtins.c (aarch64_builtins): Add enums
	for 64bits fpsr/fpcr getter setters builtin variants.
	(aarch64_init_fpsr_fpcr_builtins): New function.
	(aarch64_general_init_builtins): Modify to make use of the later.
	(aarch64_expand_fpsr_fpcr_setter): New function.
	(aarch64_general_expand_builtin): Modify to make use of the later.
	* config/aarch64/aarch64.md (@aarch64_set_<fpscr_name><GPI:mode>)
	(@aarch64_get_<fpscr_name><GPI:mode>): New patterns replacing and
	generalizing 'get_fpcr', 'set_fpsr'.
	* config/aarch64/iterators.md (GET_FPSCR, SET_FPSCR): New int
	iterators.
	(fpscr_name): New int attribute.
	* doc/extend.texi (__builtin_aarch64_get_fpcr64)
	(__builtin_aarch64_set_fpcr64, __builtin_aarch64_get_fpsr64)
	(__builtin_aarch64_set_fpsr64): Add into AArch64 Built-in
	Functions.

gcc/testsuite/ChangeLog

	* gcc.target/aarch64/get_fpcr64_1.c: New test.
	* gcc.target/aarch64/set_fpcr64_1.c: New test.
	* gcc.target/aarch64/get_fpsr64_1.c: New test.
	* gcc.target/aarch64/set_fpsr64_1.c: New test.