Compact Regions Support

While running ghc-debug-brick, I get an error message when running various commands such as finding large retainers:

ghc-debug-brick: unhandled closure typeCOMPACT_NFDATA
CallStack (from HasCallStack):
  error, called at src/GHC/Debug/Decode.hs:361:24 in ghc-debug-common-0.6.0.0-inplace:GHC.Debug.Decode

The debugee uses compact regions in a few places, and it appears that this bug is directly related to this.

Could you try using !10 it should also fix this (I think)?

Oh actually from looking at your error it doesn't seem like my patch would fix it. It should make it much easier to fix though.