[Hexagon] Adding logical-logical accumulation instructions and tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224288 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding halfword to doubleword multiplies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224289 91177308-0d34-0410-b5e6-96231b3b80d8
Sink the isa into the assert

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224291 91177308-0d34-0410-b5e6-96231b3b80d8