[perl #118791] [BUG] Rxx doesn't thunk its rhs in Rakudo

[Larry Wall via RT]

Fixed, along with all the other metaops, in:
1e1556b1a25bc4c73a505fdd249d4179ffc813de
0a2303c0f6a2a3782fecb13db1523cb5442467de
67202d697d3fe48b800e95262bebe6da17bfcf49
e2e23fb8853808839884f23a0b8aa91f458fd310
97ef742f350e84dae275ed2dc9d453795f057dba
6516930c86d6ff4296ee8699a64eb1315eed2583

Tests:
200ec05eb0865b9cbc128ba77b726111cc5a171a
52e3715b882ce8f7fa9761029ce7166725eb0bee