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/r929_memarg_reject_callsrc/case.ww

@@ -0,0 +1,16 @@
+//ww:error "sret-class tagged call result as a >48B by-value arg unwired"
+package main;
+type t_lit = rune;
+type t_any = void;
+type t_rep = struct { id: size, origin: size, m0: size, m1: size, m2: size, m3: size };
+type t_u = (t_lit | t_any | t_rep);
+fn probe(a: t_u) i32 = {
+	match (a) {
+	case let l: t_lit => { if (l == 'x') { return 1; }; return 91; };
+	case t_any => return 2;
+	case let r: t_rep => { if (r.m3 != 1234) { return 92; }; return 3; };
+	};
+	return 99;
+};
+fn mk() t_u = { return ('x': t_lit); };
+export fn main() i32 = { if (probe(mk()) != 1) { return 1; }; return 0; };