Directly subclassing Iterable is lazy-ish, but if you call any operation
on the resulting value (eg. map or ++) it will evaluate the Iterable and
return a List.

Maintenance mode

- Use regular expressions to get version strings more rigorously
- Add version discriminant function, you can compare version size
- Correct the version comparison of antlr under special conditions
- Improve the version comparison of protoc

Signed-off-by: Huang Rui <vowstar@gmail.com>

Transformation of mem readwriters whose address contain references to
readwriters of mems declared before it would contain invalid references
to untransformed memory readwriter, as the connection is not transformed.
This commit fixes this issue.

This will make it easier to compile circuits with
older compiler versions.

* [smem] fix read-under-write serialization

Also adds some tests for the parser and
the serializer.

* Serializer: always serialize smem ruw behavior

* test: simplify smem test circuit

Based on https://github.com/chipsalliance/chisel3/pull/2901.

* allow for zero-width integer literals
* CheckWidths: ensure that width is non-negative

* Enhance find_heap_bound to not go smaller than min_step

Previously, it could accidentally get a step size smaller than the
min_step and just continue looping forever. Now the while loop has a new
termination condition to catch this case.

* Add context to find_heap_bound

This new option allows for checking additional heap sizes in increments
of the min_step above the found minimum heap size.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>

Co-authored-by: Jack Koenig <koenig@sifive.com>
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* Update protobuf-java to 3.18.3

* Revert commit(s) 4b5cbaf1

* Update protobuf-java to 3.18.3

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