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/r956_modqual_mq_i64_bool_destr/case.ww

@@ -0,0 +1,14 @@
+//ww:run-exit 15
+package myf;
+export fn addi64(a: i64, b: i64) (i64, bool) = {
+	let s: i64 = a + b;
+	return (s, false);
+};
+package main;
+import myf;
+export fn main() i32 = {
+	let (res, ov) = myf.addi64(7i64, 8i64);
+	if (res != 15i64) { return 1; };
+	if (ov) { return 2; };
+	return (res: i32);
+};