calloc -- element count wrongly computed when type cannot be inferred (void*)

[ahueck]

In the following code, TypeART calculates:

• Element count: 10
• Type: 0 (aka void*, as there is not cast)

void f() {
  void* pvd = calloc(10, sizeof(double));
}

Fix

Calculate 10 * sizeof(double) in the absence of a (primary) detectable bitcast.