set TOTAL_MEMORY to default to powers of two, for now

emcc

@@ -1133,10 +1133,11 @@ try:
 
     heap = 4096
     while heap < shared.Settings.TOTAL_MEMORY:
-      if heap <= 16*1024*1024:
-        heap *= 2
-      else:
-        heap += 16*1024*1024
+      heap *= 2
+      #if heap <= 16*1024*1024:
+      #  heap *= 2
+      #else:
+      #  heap += 16*1024*1024
     if heap != shared.Settings.TOTAL_MEMORY:
       logging.warning('increasing TOTAL_MEMORY to %d to be more reasonable for asm.js' % heap)
       shared.Settings.TOTAL_MEMORY = heap