Erik Eckstein 86771468fc Swift Optimizer: move StoreInst.split into OpUtils.swift ...

To make it available in other optimizations as well.
Also, a few problems:
* Use destructre instructions when in OSSA
* Don't split the store if it's nominal type has unreferenceable stoarge
* rename it to `trySplit` because it's not guaranteed to work

Also, add the counterpart for load instructions: `LoadInst.trySplit()`

2023-07-21 07:19:56 +02:00

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