[ARM] GlobalISel: Check mappings used by reg bank select
[ARM] GlobalISel: Check mappings used by reg bank select

Add some asserts to make sure we're using the mappings that we think we're
using. This is to keep us from accidentally breaking functionality while moving
to TableGen'erated mappings.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@295441 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm