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The new code generator now apparently generates a working stage2
compiler.

See Note [foreign calls clobber GlobalRegs]

Related to #4862

All uses of it are now in an IO Monad, so we don't need to use
a trace-like function.

It's no longer a trace-like function.

They were getting baked into Config.hs before.

Thanks to Peter Wortmann for pointing out this bug.

Previously these were caught by removeDeadAssignments, but we aren't
doing that now.

The new sinker is at least as powerful, and the mini-inliner sometimes
even makes things worse.

We now track stack regions, so that we can float a stack load past a
stack store if they don't conflict.  Also, we now use the CmmType to
more accurately identify heap addresses.

Also lots of refactoring and tidyup

See Note [shortcut call returns]

Instead of relying on common-block-elimination to share return
continuations in the common case (case-alternative heap checks) we do
it explicitly.  This isn't hard to do, is more robust, and saves some
compilation time.  Full commentary in Note [sharing continuations].