Compact Regions

This brings in initial support for compact regions, as described in the
ICFP 2015 paper "Efficient Communication and Collection with Compact
Normal Forms" (Edward Z. Yang et.al.) and implemented by Giovanni
Campagna.

Some things may change before the 8.2 release, but I (Simon M.) wanted
to get the main patch committed so that we can iterate.

What documentation there is is in the Data.Compact module in the new
compact package.  We'll need to extend and polish the documentation
before the release.

Test Plan:
validate
(new test cases included)

Reviewers: ezyang, simonmar, hvr, bgamari, austin

Subscribers: vikraman, Yuras, RyanGlScott, qnikst, mboes, facundominguez, rrnewton, thomie, erikd

Differential Revision: https://phabricator.haskell.org/D1264

GHC Trac Issues: #11493

1 files changed, 1 insertions, 0 deletions

diff --git a/rts/LdvProfile.c b/rts/LdvProfile.c
index 428078bb40..26ead95061 100644
--- a/rts/LdvProfile.c
+++ b/rts/LdvProfile.c
@@ -142,6 +142,7 @@ processHeapClosureForDead( const StgClosure *c )
     case RET_BIG:
         // others
     case INVALID_OBJECT:
+    case COMPACT_NFDATA:
     default:
         barf("Invalid object in processHeapClosureForDead(): %d", info->type);
         return 0;