Inlined finally code may run at the wrong context level

[DartBot]

This issue was originally filed by @mhausner

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This simple program crashes

test(b) {
  try {
    for (int i = 0; i < 10; i++) {
      // Closurizing i and b, thus the return statement
      // executes at context level 2, and the code in
      // the finally block runs at context level 1.
      return () => i + b;
    }
  } finally {
    b = 10;
  }
}

main() {
  var c = test(0);
}

The VM falsely restores the context to the saved try_context before executing the inlined assignment to b. Thus, accessing b accesses a non-existing context and the VM crashes.

Fix is on its way.

[DartBot]

This comment was originally written by @mhausner

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https://codereview.chromium.org/1006463003/

Fixed in r44465.

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Added Fixed label.