Fixed -d:useMalloc allocShared / reallocShared / deallocShared. These…

… now use the alloc/dealloc/realloc implementation that also takes care of zeroing memory at realloc.

lib/system/mmdisp.nim

@@ -384,15 +384,16 @@ elif (defined(nogc) or defined(gcDestructors)) and defined(useMalloc):
     proc dealloc(p: pointer) = c_free(cast[pointer](cast[int](p) - sizeof(int)))
 
     proc allocShared(size: Natural): pointer =
-      result = c_malloc(size.csize_t)
+      result = alloc(size.csize_t)
       if result == nil: raiseOutOfMem()
     proc allocShared0(size: Natural): pointer =
       result = alloc(size)
       zeroMem(result, size)
     proc reallocShared(p: pointer, newsize: Natural): pointer =
-      result = c_realloc(p, newsize.csize_t)
+      result = realloc(p, newsize.csize_t)
       if result == nil: raiseOutOfMem()
-    proc deallocShared(p: pointer) = c_free(p)
+    proc deallocShared(p: pointer) =
+      dealloc(p)
 
     proc GC_disable() = discard
     proc GC_enable() = discard