Fix #8754 in a round-about way.
For some reason on OS X, it seems like -Bsymbolic (which we use for hooks into the RTS) isn't working, which results in #8754, where stats don't work because defaultHooks doesn't initialize the stats flag. This seems to work on Linux static/dynamically, but only on OS X statically. After talking with Simon, really, the entire hooks thing is a bit fragile. For now, we just work around it (since GHCi is dynamically linked) by calling into the defaultHooks ourselves when GHC starts. Signed-off-by: Austin Seipp <firstname.lastname@example.org>