[ARM][ParallelDSP] Combine structs
[ARM][ParallelDSP] Combine structs

Combine OpChain and BinOpChain structs as OpChain is a base class to
BinOpChain that is never used.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@367114 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm