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/r766_star_fn_deref_branched/case.ww

@@ -0,0 +1,10 @@
+//ww:run-exit 107
+package main;
+fn aa(x: i32) i32 = { return x; };
+fn bb(x: i32) i32 = { return x + 100; };
+export fn main() i32 = {
+	let pick: i32 = 1;
+	let f: *fn(x: i32) i32 = &aa;
+	if (pick != 0) { f = &bb; };
+	return (*f)(7);
+};