test: migrate 700_e2e rows to corpus fixtures; retire the carrier

136 rows migrated, 0 already owned, 3 wwstage-failing rows held out.

test/wcc/data/r700_defer_lifo_syscall/case.ww

@@ -0,0 +1,14 @@
+//ww:run-exit 0
+// Migrated from 700_e2e row 13.
+package main;
+@symbol("rt_syscall") fn rt_syscall(num: i64, a: i64, b: i64, c: i64) i64;
+fn out(c: i32) void = { rt_syscall(1, 1, (&c): i64, 1); };
+fn main() i32 = {
+  let c1: i32 = 0;
+  let c2: i32 = 0;
+  c1 = 65;
+  c2 = 66;
+  defer out(c1);
+  defer out(c2);
+  return 0;
+};