test/wcc/data: grow the declarative compiler corpus to 1,224 fixtures

The r-prefixed waves absorb the runtime, reject, and byte-compare rows
of the migrated native carriers; each fixture is one directory with one
case.ww and a //ww:error, //ww:compile, //ww:run, or //ww:run-exit
directive covering both frontends.

test/wcc/data/r767_match_variant_ptr_past_zero/case.ww

@@ -0,0 +1,11 @@
+//ww:run-exit 22
+package main;
+export fn main() i32 = {
+	let a: i64 = 42;
+	let v: (*i32 | *i64) = &a;
+	let r: i32 = match (v) {
+	case *i32 => yield 11: i32;
+	case *i64 => yield 22: i32;
+	};
+	return r;
+};