[PowerPC][XCOFF] Remove basic test. [NFC]
[PowerPC][XCOFF] Remove basic test. [NFC]

Test verified that we could compile an empty module and produce an XCOFF
object file. Newer tests superssed this coverage, its safe to remove.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@371247 91177308-0d34-0410-b5e6-96231b3b80d8

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