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This patch fixes a dirty hack (the fake ThFake module), which in turn
was causing Trac #2632.

The new scheme is that the top-level binders in a TH [d| ... |] decl splice
get Internal names.  That breaks a previous invariant that things like
TyCons always have External names, but these TyCons are never long-lived;
they live only long enough to typecheck the TH quotation; the result is
discarded.  So it seems cool.

Nevertheless -- Template Haskell folk: please test your code.  The testsuite
is OK but it's conceivable that I've broken something in TH.  Let's see.

nameModule fails on an InternalName.  These ASSERTS tell you
which call failed.

To get the ModSummary for a ModuleName getModSummary can be used.
It's not called find* or lookup* because it assumes that the module is
in the module graph and throws an exception if it cannot be found.
Overall, I'm not quite sure about the usefulness of this function
since the user has no control about which filetype to grab (hs or
hs-boot).

  MERGE TO 6.10

  MERGE TO 6.10

See Note [Binder swap on GlobalId scrutinees].  I hadn't got this
right before, so repeated cases on imported Ids weren't getting optimised.

SpecConstr can make pattern binders come alive, so we must remember
to zap their dead-variable annotation.  See extendCaseBndrs.

(This was triggering a Core Lint failure in DPH.)

We forgot to document this in GHC 6.8

- Pattern signatures must be identical to the type expected for the pattern;
  see Note [Pattern coercions]
- We now signal an appropriate error if an equality coercion would be needed
  (instead of just generating Core that doesn't typecheck)

  MERGE TO 6.10

This adds a new flag -finline-if-enough-args which disables inlining for
partially applied functions. It is automatically set by -Odph. This is a
temporary hack and should remain undocumented.

MERGE TO 6.10

There was a race condition whereby a thread doing throwTo could be
blocked on a thread that had finished, and the GC would detect this
as a deadlock rather than raising the pending exception.  We can't
close the race, but we can make the right thing happen when the GC
runs later.

  MERGE TO 6.10

- This cleans up some of the mess in reduceImplication and documents the
  precondition on the form of wanted equalities properly.
- I also made the back off test a bit smarter by allowing to back off in the
  presence of wanted equalities as long as none of them got solved in the
  attempt.  (That should save generating some superfluous bindings.)

  MERGE TO 6.10

  MERGE TO 6.10

Needed for #738 fix

My guess is that this is left over from when we represented Int8 and
friends as zero-extended rather than sign-extended.  It's amazing it hasn't
been noticed earlier.

Unconditionalize definition of DYNAMIC_* so that libffi.so/.dll is removed even when BuildSharedLibs is reset to NO

MERGE TO 6.10

- applySubstFam, applySubstVarVar & applySubstVarFam need to return their 
  second argument -to be put into the todo list- if the rule would be 
  applicable if the equalities would be supplied in the opposite order.

MERGE TO 6.10

A previous patch slightly changed the semantics of tryUser.
This patch restores the original behaviour
(as expected in :print)

I'm not sure why it works in the HEAD, but when making an installer
from the 6.10.1 beta configure hangs when doing the CHECK_HIST_ERRORS
test (during rl_initialize, I believe). Giving make /dev/null as stdin
fixes it.