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Don't use mmap on powerpc-apple-darwin as mmap doesn't support
reallocating but we need to allocate jump islands just after each
object images. Otherwise relative branches to jump islands can fail
due to 24-bits displacement overflow.

This routine should be aware of Mach-O misalignment of malloc'ed memory regions.

Use fseek(3) instead of rewind(3) to move the file position indicator back to the initial position. Otherwise we can't use this function in loadArchive().

I found this function causes a segfault when ocAllocateSymbolExtras() has allocated a separate memory region for jump islands.

The extension was rejected by Haskell', and deprecated in 7.0.

GHCi libs are no longer necessary, as we can use the .a or .so versions
instead.

If the GHCi .o lib doesn't exist, load the .a instead

This makes sure that join points are fully specialised in loops which are
marked as ForceSpecConstr.

Now, -ddump-rule-firings only shows the names of the rules that fired (it would
show "before" and "after" with -dverbose-core2core previously) and
-ddump-rule-rewrites always shows the "before" and "after" bits, even without
-dverbose-core2core.

This patch removes the Lint test, and comments why

See Note [WildCard binders] in SimplEnv.  Spotted by Roman.

This was causing Trac #4524, by optimising
     (e |> co)  to   e
on the LHS of a rule.  Result, the template variable
'co' wasn't bound any more.

Now that substition doesn't optimise, it seems sensible to call
simpleOptExpr rather than substExpr when substituting in the
RHS of rules.  Not a big deal either way.