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/r701_five_i32_reassign_lit/case.ww

@@ -0,0 +1,8 @@
+//ww:run-exit 30
+package main;
+type five = struct { a: i32, b: i32, c: i32, d: i32, e: i32 };
+fn main() i32 = {
+	let s: five = five { a = 0, b = 0, c = 0, d = 0, e = 0 };
+	s = five { a = 2, b = 4, c = 6, d = 8, e = 10 };
+	return s.a + s.b + s.c + s.d + s.e;
+};