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[FIRRTL] Support layers in MergeConnections #7912

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[FIRRTL] Support layers in MergeConnections #7912

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Commits on Nov 27, 2024

  1. [FIRRTL] Support layers in MergeConnections 

    Modify the `MergeConnections` pass to walk into regions and blocks.
Because the algorithm used in this pass wants to insert operations _after_
the operation that is currently being processed _and then_ visit them,
this cannot use a normal `Operation::walk` (since this will pre-increment
and not visit these operations).  Keep this existing algorithm, but use an
iterator worklist to make this behave like a walk.

This is done as part of moving `LowerLayers` to the end of the FIRRTL
pipeline so that inline layer support (which requires producing `sv.ifdef`
operations which we would like to hide from the rest of the FIRRTL
pipeline) can be turned on.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>
    @seldridge
    seldridge committed Nov 27, 2024
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