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We were making arrays with range (0, n-1) which is bad if n == 0 now
that we are using Word types.

We were keeping things as Int, and then converting them to Word16 at
the last minute, when really they ought to have been Word16 all along.

For inexpensive assertions

Instead of chr_$wchr, we now just get $wchr.  In general, when an
OccName is system-generated, we leave it out of the final external
name, preferring to use the name of the exported parent instead (which
is necessarily a user-written name).

Names should be no less deterministic, but should be shorter and more
readable.

It still lives in darcs, if anyone wants to revive it sometime.

Not a real fix: if this bites us again we'll have to rethink

Fixes #3168

This means GHC knows whether it's building a Cabal package, or just
Haskell sources. For example, it may wish to give different error
messages when building a Cabal package.

This also fixes a memory leak on Windows with -threaded, because we
were calling initMutex(&gc_running_mutex) for each GC, which allocates
memory.

And kill the duplicate one in HsSyn.Convert

It should be safe to use now that we aren't relying on C prototypes
for foreign functions in via-C code.