PR c++/51033
gcc/
	* c-typeck.c (build_array_ref): Call
	convert_vector_to_pointer_for_subscript.
gcc/c-family
	* c-common.c (convert_vector_to_pointer_for_subscript): New function.
	* c-common.h (convert_vector_to_pointer_for_subscript): Declare it.
gcc/cp/
	* typeck.c (cp_build_array_ref): Handle VECTOR_TYPE.
	* decl2.c (grok_array_decl): Likewise.

From-SVN: r186994