[AArch64] Adjust the cost model for Exynos M1 and M2

Add new predicate to more accurately model the scheduling around branches
and function calls and of loads and stores of pairs and integer
multiplications.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311944 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed