Both the front-end and code generator had a modulo by zero bug when testing if
a conversion from a static array to dynamic array was valid.

	PR d/101490

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 27e388b4c.
	* d-codegen.cc (build_array_index): Handle void arrays same as byte.
	* d-convert.cc (convert_expr): Handle converting to zero-sized arrays.

gcc/testsuite/ChangeLog:

	* gdc.dg/pr101490.d: New test.