JIT: fix spill logic for local structs (#797)

JIT: fix spill logic for local structs (#797)

If we're appending an assignment whose LHS is is a location within a local
struct, we need to spill all references to that struct from the eval stack.

Update the existing logic for this to handle the case where the LHS is a field
of a local struct, and the field is updated by unusual means (here, `initobj`).

Fixes #764.