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    The flag enables the use of Show instances in :print.
    By default they are not used anymore

It is needed by cmm/StackColor, and hence is needed even when there is no
native code generator.

  -- LastBranch no longer takes parameters
  -- LastJump and LastReturn no longer carry CmmActuals;
     instead, those are carried by a CopyOut in the same basic block

We now set the flags once and for all in compiler/Makefile.

OK, so the name is a bit wrong now...

haddock sometimes makes doc-index-A.html etc files. Not sure why it
doesn't for me.
Patch from Judah Jacobson.

On Windows we now always use a path beginning $topdir/ so bindists are
relocatable.

We also now tell "Setup configure" where we are putting the
documentation, and tell installPackage to override as little as
possible.

This patch combines two changes:
  1. As requested by SimonPJ, the redundancy inherent in having
     LastCall bear actual parameters has been removed.  The actual
     parameters are now carried by a separate CopyOut node.
  2. The internal (to zipper) representation of calls has changed;
     the representation of calling conventions is more orthogonal,
     and there is now no such thing as a 'safe' or 'final' call
     to a CallishMachOp.   This change has affected the interface
     to MkZipCfgCmm, which now provides a static guarantee.  Simon's
     new upstream code will be affected; I've patched the existing
     code in CmmCvt (which becomes ever hairier).
  

binutils <2.17 can't generate PC64 relocations for x86_64. Hence we
emit only 32 bit PC relative offsets, and artifically stick a zero in
front of them to make them 64 bit (see PprMach.sh ppr_item in
pprDataItem). This works as long as the offset is <32bit AND it's
positive. This is not the case for offsets in jump tables, they are
all negative. This hack sign extends them with a MOVSXL instruction
into the dead index register, then adding the properly sign extended
offset to the jump table base label giving the correct target address
for the following jump.

The term pretty printer used by :print shouldn't output 
the contents of TypeRep values, e.g. inside Dynamic values

- Fixes a bug introduced with the patch named 
  'check for unreachable code only with -DDEBUG'
- Breakage occured only without -DDEBUG (which is 'valdiate's default!)

Interface MkZipCfgCmm should now be sufficient for all construction
needs, though some identifiers are re-exported from (and explained in)
MkZipCfg.  ZipCfgCmmRep should be used only by modules involved in
analysis, optimization, or translation of Cmm programs.

(Previously, ppr had tried to make the zipper representation look as
much like the ListGraph representation as possible.  This decision was
unhelpful for debugging, so although the old code has been retained,
the new default is to tell it like it is.  It may be possible to
retire PprCmmZ one day, although it may be desirable to retain it as
the internal form becomes less readable.