Andrew Trick 0407a4e34a Add UpdatingInstructionIterator. ...

Track in-use iterators and update them both when instructions are
deleted and when they are added.

Safe iteration in the presence of arbitrary changes now looks like
this:

    for (SILInstruction *inst : deleter.updatingRange(&bb)) {
      modify(inst);
    }

2021-06-02 07:38:27 -07:00

2.8 KiB

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