ARM sched model: Add divsion, loads, branches, vfp cvt

Add some generic SchedWrites and assign resources for Swift and Cortex A9.

Reapply of r183257. (Removed empty InstRW for division on swift)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183319 91177308-0d34-0410-b5e6-96231b3b80d8