Increment a memory managed type reference count
void SLang_inc_mmt (SLang_MMT_Type *mmt);
The SLang_inc_mmt function may be used to increment the
reference count associated with the memory managed data type given
by mmt.
SLang_free_mmt, SLang_create_mmt, SLang_pop_mmt, SLang_pop_mmt