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/alias_fsarg2_bound/case.ww

@@ -0,0 +1,18 @@
+//ww:error c "#271/#165: float-bearing struct arg from a non-ident source" ww "#272/#276/#277: aggregate return reaches scalar default"
+package main;
+
+type fs0 = struct { x: f64 };
+type fs = fs0;
+
+fn mk() fs = {
+	let s: fs;
+	s.x = 2.5;
+	return s;
+};
+
+fn g(p: fs) f64 = { return p.x; };
+
+export fn main() i32 = {
+	if (g(mk()) != 2.5) { return 1; };
+	return 0;
+};