[CodeGenPrepare] Pre-commit debug info test for optimizeSelectInst
[CodeGenPrepare] Pre-commit debug info test for optimizeSelectInst

This test shows that optimizeSelectInst splits a select and sinks a
`fdiv` operation to one side of the diamond. However, the dbg.value for
the operation isn't moved.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@340369 91177308-0d34-0410-b5e6-96231b3b80d8

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