[m-rev.] diff: Increase HBLKSIZE in BoehmGC for parallel grades.

[Paul Bone]

When bulding the garbage collector in a parallel grade increase the
thread-local free list size by increasing HBLKSIZE.  This causes memory
allocation to access global resources less often improving parallel
performance.

Mmake.common.in:
    As above.

Index: Mmake.common.in
===================================================================
RCS file: /home/mercury1/repository/mercury/Mmake.common.in,v
retrieving revision 1.97
diff -u -p -b -r1.97 Mmake.common.in
--- Mmake.common.in	10 Oct 2009 10:44:13 -0000	1.97
+++ Mmake.common.in	8 Dec 2010 03:50:43 -0000
@@ -150,7 +150,8 @@ BOEHM_CFLAGS = @ENABLE_BOEHM_LARGE_CONFI
 # Additional options to pass to the C compiler when building Boehm-GC for
 # threads.
 BOEHM_CFLAGS_FOR_THREADS = @ENABLE_BOEHM_THREAD_LOCAL_ALLOC@ \
-	@ENABLE_BOEHM_PARALLEL_MARK@
+	@ENABLE_BOEHM_PARALLEL_MARK@ \
+	-DHBLKSIZE=32768 -DCPP_LOG_HBLKSIZE=15
 
 # Do we want to deal with intermodule information when building the library?
 # By default yes, since this way we note immediately when intermodule
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