This patch sets the branch cost to the same most optimal setting for all Cortex

This patch sets the branch cost to the same most optimal setting for all Cortex
cores, reducing codesize and improving performance due to using more CSEL
instructions.  Set the autoprefetcher model in Cortex-A72 to weak like the
others.  Enable AES fusion in Cortex-A35.  As a result generated code is now
more similar as well as more optimal across Cortex cores.

    gcc/
	* config/aarch64/aarch64.c (cortexa35_tunings):
	Enable AES fusion.  Use cortexa57_branch_cost.
	(cortexa53_tunings): Use cortexa57_branch_cost.
	(cortexa72_tunings): Use cortexa57_branch_cost.
	Use AUTOPREFETCHER_WEAK.
	(cortexa73_tunings): Use cortexa57_branch_cost.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@237884 138bc75d-0d04-0410-961f-82ee72b054a4