[x86] Tidy up test case, generate check lines with script. NFC.
[x86] Tidy up test case, generate check lines with script. NFC.

Just adds basic block labels and tidies up where comments go in the test
case and then generates fresh CHECK lines with the script. This way, the
check lines are much easier to maintain. They were already close to this
but not quite there.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@329040 91177308-0d34-0410-b5e6-96231b3b80d8

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