Fix a xallocx(..., MALLOCX_ZERO) bug.

Fix xallocx(..., MALLOCX_ZERO to zero the last full trailing page of
large allocations that have been randomly assigned an offset of 0 when
--enable-cache-oblivious configure option is enabled.  This addresses a
special case missed in d260f442ce693de4351229027b37b3293fcbfd7d (Fix
xallocx(..., MALLOCX_ZERO) bugs.).
diff --git a/ChangeLog b/ChangeLog
index e3b0a51..cd8f695 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,13 @@
 
     https://github.com/jemalloc/jemalloc
 
+* 4.0.4 (XXX)
+
+  Bug fixes:
+  - Fix xallocx(..., MALLOCX_ZERO to zero the last full trailing page of large
+    allocations that have been randomly assigned an offset of 0 when
+    --enable-cache-oblivious configure option is enabled.
+
 * 4.0.3 (September 24, 2015)
 
   This bugfix release continues the trend of xallocx() and heap profiling fixes.