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* Fix bugs in the packing and unpacking of data
  constructors with equality predicates in their types

* Remove PredCo altogether; instead, coercions between predicated
  types (like  (Eq a, [a]~b) => blah) are treated as if they
  were precisely their underlying representation type
       Eq a -> ((~) [a] b) -> blah
  in this case

* Similarly, Type.coreView no longer treats equality
  predciates specially.

* Implement the cast-of-coercion optimisation in
  Simplify.simplCoercionF

Numerous other small bug-fixes and refactorings.

Annoyingly, OptCoercion had Windows line endings, and this
patch switches to Unix, so it looks as if every line has changed.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

the other mutator threads (#5127)

The code that prints the "one-line" stats (i.e. the RTS -t flag) was
incorreclty printing zeros for some time values. These time values
were computed inside a conditional that was only true when printing
detailed stats (i.e. the RTS -s or -S flags).

This commit simply moves the computation out of the conditional so
they are available for the one-line stats output.

This was making mc17 fail.

This was making T3822 fail, which it has apparently been doing
for some time (ie in GHC 7, 6.12, 6.10)!

on x86_64).

gen_workspace structures.  Fixes heapprof001(prof_hc_hb).

having this meant we weren't getting -no-user-package-conf, which
caused a build failure for me due to locally-installed packages being
used instead of ones in the tree.

And remove cTargetOS/cTargetPlatform.

We want to use it across the whole compiler now

We now do it while parsing the flags, rather than at the end.
It also now uses the Platform's arch/os variables, rather than Config's.

Not needed now that we don't support registerised via-C compilation.

The code for constructors in cvReconstrutType and cvObtainTerm
was grotesque.  It's now slightly better.  And it works with
the new coercion representation.

Apart from being simpler I have also made some small behavioural
improvements
  * Improved printing for string values
  * Preserve the print-name when instanting type variables
    (so now they are not always called "t")
  * Suppressed printing of predicate arguments to
    data constructors, unless -dppr-debug is on

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>