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/r940_global_sret_pointer/case.ww

@@ -0,0 +1,18 @@
+//ww:run
+// Runtime half of 940_global_sret_run.c global_through_pointer.
+package main;
+type quad = struct { a: i64, b: i64, c: i64, d: i64 };
+fn mk(x: i64) quad = {
+	return quad { a = x, b = x + 1i64, c = x + 2i64, d = x + 3i64 };
+};
+fn bump(p: *quad) void = { p.a += 100i64; };
+let g: quad;
+export fn main() i32 = {
+	g = mk(7i64);
+	bump(&g);
+	if (g.a != 107i64) { return 1; };
+	if (g.b != 8i64) { return 2; };
+	if (g.c != 9i64) { return 3; };
+	if (g.d != 10i64) { return 4; };
+	return 0;
+};