3cc34d54c1
lowerBreak/lowerContinue emitted a bare br, and the enclosing block's emitBlockDefers — seeing the terminator — discarded the pending entries on the assumption a return had already drained them. The breaking iteration's defers were silently skipped, leaking whatever the cleanup released. Lowering.loop_defer_base records the defer-stack height at each loop's body start (while / for / range-for, saved and restored alongside break_target); break/continue drain non-onfail entries down to it in LIFO order via the non-truncating emitLoopExitDefers before branching. Truncation stays with the lexical block exits — the same entries still belong to the fall-through path after the branch containing the break. break/continue outside a loop now diagnose instead of no-op'ing. Regression: examples/0049-basic-defer-break-continue.sx (for and while, break and continue, nested-block LIFO drain).
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