aarch64: Rename AARCH64_FL_FOR_ARCH macros

aarch64: Rename AARCH64_FL_FOR_ARCH macros

This patch renames AARCH64_FL_FOR_ARCH* macros to follow the
same V<number><profile> names that we (now) use elsewhere.

The names are only temporary -- a later patch will move the
information to the .def file instead.  However, it helps with
the sequencing to do this first.

gcc/
	* config/aarch64/aarch64.h (AARCH64_FL_FOR_ARCH8): Rename to...
	(AARCH64_FL_FOR_V8A): ...this.
	(AARCH64_FL_FOR_ARCH8_1): Rename to...
	(AARCH64_FL_FOR_V8_1A): ...this.
	(AARCH64_FL_FOR_ARCH8_2): Rename to...
	(AARCH64_FL_FOR_V8_2A): ...this.
	(AARCH64_FL_FOR_ARCH8_3): Rename to...
	(AARCH64_FL_FOR_V8_3A): ...this.
	(AARCH64_FL_FOR_ARCH8_4): Rename to...
	(AARCH64_FL_FOR_V8_4A): ...this.
	(AARCH64_FL_FOR_ARCH8_5): Rename to...
	(AARCH64_FL_FOR_V8_5A): ...this.
	(AARCH64_FL_FOR_ARCH8_6): Rename to...
	(AARCH64_FL_FOR_V8_6A): ...this.
	(AARCH64_FL_FOR_ARCH8_7): Rename to...
	(AARCH64_FL_FOR_V8_7A): ...this.
	(AARCH64_FL_FOR_ARCH8_8): Rename to...
	(AARCH64_FL_FOR_V8_8A): ...this.
	(AARCH64_FL_FOR_ARCH8_R): Rename to...
	(AARCH64_FL_FOR_V8R): ...this.
	(AARCH64_FL_FOR_ARCH9): Rename to...
	(AARCH64_FL_FOR_V9A): ...this.
	(AARCH64_FL_FOR_ARCH9_1): Rename to...
	(AARCH64_FL_FOR_V9_1A): ...this.
	(AARCH64_FL_FOR_ARCH9_2): Rename to...
	(AARCH64_FL_FOR_V9_2A): ...this.
	(AARCH64_FL_FOR_ARCH9_3): Rename to...
	(AARCH64_FL_FOR_V9_3A): ...this.
	* common/config/aarch64/aarch64-common.cc (all_cores): Update
	accordingly.
	* config/aarch64/aarch64-arches.def: Likewise.
	* config/aarch64/aarch64-cores.def: Likewise.
	* config/aarch64/aarch64.cc (all_cores): Likewise.