Erik Eckstein 87f2f41d51 Swift Optimizer: add infrastructure for module passes. ...

To add a module pass in `Passes.def` use the new `SWIFT_MODULE_PASS` macro.
On the swift side, create a `ModulePass`.
It’s run function receives a `ModulePassContext`, which provides access to all functions of a module.
But it doesn't provide any APIs to modify functions.
In order to modify a function, a module pass must use `ModulePassContext.transform(function:)`.

2022-08-24 17:55:02 +02:00

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