Many supported cores implement fusion of AES instructions.

Many supported cores implement fusion of AES instructions.

Many supported cores implement fusion of AES instructions.  When fusion
happens it can give a significant performance gain.  If not, scheduling
fusion candidates next to each other has almost no effect on performance.
Due to the high benefit/low cost it makes sense to enable AES fusion with
-mcpu=generic so that cores that support it always benefit.

    gcc/
	* config/aarch64/aarch64.c (generic_tunings): Add AES fusion.

From-SVN: r246395