[MCJIT] Temporarily disable automatic JIT debugger registration.
[MCJIT] Temporarily disable automatic JIT debugger registration.

The RuntimeDyld cleanup patch r222810 turned on GDB registration for MachO
objects. I expected this to be harmless, but it seems to have broken on
MacsOS. Temporarily disabling debugger registration while I dig in to what's
gone wrong.



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@222811 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,dslab-epfl/asap,apple/swift-llvm,GPUOpen-Drivers/llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,apple/swift-llvm,dslab-epfl/asap,dslab-epfl/asap,GPUOpen-Drivers/llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,dslab-epfl/asap,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,dslab-epfl/asap,apple/swift-llvm