Try to appease the Windows build bots.
Try to appease the Windows build bots.

Several of the conditonal operators commited in llvm-svn: 365524 fail to compile
on the windows buildbots. Converting to an if and early return to try to fix.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@365535 91177308-0d34-0410-b5e6-96231b3b80d8

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