Bug 706442: Shorten LifoAlloc chunk chain. (r=luke)

js/src/ds/LifoAlloc.cpp

@@ -140,11 +140,10 @@ LifoAlloc::freeUnused()
     }
 
     /* Free all chunks after |latest|. */
-    size_t freed = 0;
-    for (BumpChunk *victim = latest->next(); victim; victim = victim->next()) {
+    for (BumpChunk *victim = latest->next(); victim; victim = victim->next())
         BumpChunk::delete_(victim);
-        freed++;
-    }
+
+    latest->setNext(NULL);
 }
 
 LifoAlloc::BumpChunk *

js/src/ds/LifoAlloc.h

@@ -325,7 +325,8 @@ class LifoAlloc
     void *reallocUnaligned(void *origPtr, size_t origSize, size_t incr);
 };
 
-class LifoAllocScope {
+class LifoAllocScope
+{
     LifoAlloc   *lifoAlloc;
     void        *mark;
     bool        shouldRelease;