C: fix reported range of invalid unary dereference.

C: fix reported range of invalid unary dereference.

gcc/c/ChangeLog:
	* c-parser.c (c_parser_unary_expression): For dereferences, build
	a combined location before calling build_indirect_ref, so that
	error reports cover the full range, manually updating the c_expr
	src_range.

gcc/testsuite/ChangeLog:
	* gcc.dg/bad-dereference.c: New test case.

From-SVN: r232110