message: mtp.cpp: increase `M_COST` from 4KB to 4MB
diff: @@ -32,7 +32,7 @@ namespace {
  const int8_t L = 72;
  const unsigned T_COST = 1;
  -const unsigned M_COST = 1024 * 4;
  +const unsigned M_COST = 4 * 1024 * 1024;
  const unsigned LANES = 4;
  void StoreBlock(void *output, const block *src)
  