free() and realloc() function changes

In releases before IBM® i 7.2, the free() and reallc() functions did not always generate a message when used to free or reallocate heap storage from a different activation group. This restriction is documented but was not always handled correctly. Extra checking is enabled in 7.2 to correctly diagnose the improper usage and generate a C2M1212 diagnostic message when these functions are used to free or reallocate storage from a different activation group.