Fix: ForRangeLoopStmt body pop is silently discarded without null check

[yuvimittal]

Summary

The body result is popped with _ = self.result_stack.pop() — no safe_pop, no guard. If the loop body is a block that terminates early (return/break) without pushing a value, this raises IndexError and leaks IR state. The ForCountLoopStmt has the same pattern with _body_val.

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IRx version

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[m-akhil-reddy]

@yuvimittal , i would like to work it.

[m-akhil-reddy]

Status :- #251