Purge unused dirty pages in a fragmentation-reducing order.

Purge unused dirty pages in an order that first performs clean/dirty run
defragmentation, in order to mitigate available run fragmentation.

Remove the limitation that prevented purging unless at least one chunk
worth of dirty pages had accumulated in an arena.  This limitation was
intended to avoid excessive purging for small applications, but the
threshold was arbitrary, and the effect of questionable utility.

Relax opt_lg_dirty_mult from 5 to 3.  This compensates for increased
likelihood of allocating clean runs, given the same ratio of clean:dirty
runs, and reduces the potential for repeated purging in pathological
large malloc/free loops that push the active:dirty page ratio just over
the purge threshold.

doc/jemalloc.xml.in

@@ -833,7 +833,7 @@ for (i = 0; i < nbins; i++) {
         <manvolnum>2</manvolnum></citerefentry> or a similar system call.  This
         provides the kernel with sufficient information to recycle dirty pages
         if physical memory becomes scarce and the pages remain unused.  The
-        default minimum ratio is 32:1 (2^5:1); an option value of -1 will
+        default minimum ratio is 8:1 (2^3:1); an option value of -1 will
         disable dirty page purging.</para></listitem>
       </varlistentry>