[ARM] ACLE parallel arithmetic and DSP style multiplications

This is a follow up of r302131, in which we forgot to add SemaChecking
tests. Adding these tests revealed two problems which have been fixed:
- added missing intrinsic __qdbl,
- properly range checking ssat16 and usat16.

Differential Revision: https://reviews.llvm.org/D40888


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@320019 91177308-0d34-0410-b5e6-96231b3b80d8