mars.exec_main_func doesn't put result in localtable

[Matt Giuca]

Mars passes the empty localtable to executor.exec_instr. This works with the interpret backend, but is invalid, as the instruction is referencing a variable which is not in the localtable. Other backends may expect it to be there (so they can figure out the variable's type, for instance).

Pass a localtable with a single entry, for the $T variable being assigned.

[Matt Giuca (mgiuca)]

Fixed in trunk r1124.