[Hexagon] Removing SUB_rr and replacing with A2_sub.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222571 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] add statistic counter to dynamic alloca instrumentation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222573 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding sxtb instruction.  Renaming some identically named classes that will be removed after converting referencing defs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222575 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding sxth instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222577 91177308-0d34-0410-b5e6-96231b3b80d8