[ARM] ParallelDSP: added statistics, NFC.

Added statistics for the number of SMLAD instructions created, and
als renamed the pass name to -arm-parallel-dsp.

Differential Revision: https://reviews.llvm.org/D48971


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336441 91177308-0d34-0410-b5e6-96231b3b80d8
14 files changed