Correct the TH fix of Oct 26, involving thFAKE
		MERGE TO STABLE

Original message
  1) A bug in the renaming of [d| brackets |]. The problem was
  that when we renamed the bracket we messed up the name cache, because
  the module was still that of the parent module. Now we set a fake
  module before renaming it.

But we have to tell the *typechecker* too, not just the renamer.
See comments with TcSplice.tc_bracket (DecBr case).

Should fix TH failures in the STABLE branch