[GlobalISel] Legalize G_(S|U)DIV libcalls
[GlobalISel] Legalize G_(S|U)DIV libcalls

Treat them the same as the other binary operations that we have so far,
but on integers rather than floating point types. Extract the common
code into a helper.

This will be used in the ARM backend.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@301163 91177308-0d34-0410-b5e6-96231b3b80d8

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