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/r78_named_ptr_alias_degenerate_ambig/case.ww

@@ -0,0 +1,18 @@
+//ww:error "bare source structurally matches >=2 NAMED variants"
+package main;
+type vtable = struct { x: i32 };
+type sa = *vtable;
+type sb = *vtable;
+type h = (sa | sb);
+fn w(x: h) i32 = {
+	match (x) {
+	case sa => return 1;
+	case sb => return 2;
+	};
+};
+fn emit(v: *vtable) i32 = { return w(v); };
+export fn main() i32 = {
+	let vt: vtable;
+	vt.x = 0;
+	return emit(&vt);
+};