re PR c/64423 (Incorrect column number of -Wchar-subscripts)

re PR c/64423 (Incorrect column number of -Wchar-subscripts)

	PR c/64423
c-family/
	* c-common.c (warn_array_subscript_with_type_char): Add location_t
	parameter.  Use it.
	* c-common.h (warn_array_subscript_with_type_char): Update
	declaration.
c/
	* c-typeck.c (build_array_ref): Pass loc down to
	warn_array_subscript_with_type_char.
cp/
	* typeck.c (cp_build_array_ref): Pass loc down to
	warn_array_subscript_with_type_char.
testsuite/
	* gcc.dg/pr64423.c: New test.

From-SVN: r219186