* gc.c (vm_malloc_increase): do gc_rest_sweep() before GC.
  gc_rest_sweep() can reduce malloc_increase, so try it before GC.
  Otherwise, malloc_increase can be less than malloc_limit at
  gc_before_sweep(). This means that re-calculation of malloc_limit
  may be wrong value.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43424 b2dd03c8-39d4-4d8f-98ff-823fe69b080e