Changeset 6896548 for libcfa/src/iostream.cfa

Fixed convert-convert issues with strings, when conversion happens after resolve. Three specific issues fixed.

1. String literals were not roundtripping new-old-new with the original type at the constant level, whereas the resolver changes the expression-level type from array to pointer.
2. String literals were roundtripping with noise on a "--print astexpr" diff, with the char-array's index type coming up signed int (expecting unsigned long long int).
3. Function calls that pass a foo[] variable as argument to a foo* formal were crashing on copy-constructor generation because convert-convert was changing the arg-expression type from foo* (set by the resolver, as expecteed) back to foo[], taken from the variable (switched to foo* taken from convert-src expression).