Added documentation to :=, <>
Renamed ir.BulkConnect to ir.PartialConnect
Cleaned up some internal functions

Change the type of modules that the traceName API can be used for from
"Module" to "RawModule".  This fixes a bug where this API couldn't be
used for RawModules even though it totally works.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@sifive.com>

* Add unit test for Issue 2760

* checkpoint: Fix for nested instance

* remove comments about stuff not working

* make the test check the output a little more

* relax the requirement on returning empty ioMap

* Update core/src/main/scala/chisel3/experimental/hierarchy/core/Lookupable.scala

* Update core/src/main/scala/chisel3/Data.scala

* Update core/src/main/scala/chisel3/experimental/hierarchy/core/Lookupable.scala

Co-authored-by: Jack Koenig <koenig@sifive.com>

* Update src/test/scala/chiselTests/experimental/hierarchy/InstanceSpec.scala

Co-authored-by: Jack Koenig <koenig@sifive.com>

* Update core/src/main/scala/chisel3/experimental/hierarchy/core/Lookupable.scala

* Add another unit test which unfortunately still passes

* Update core/src/main/scala/chisel3/Data.scala

* Update src/test/scala/chiselTests/experimental/hierarchy/InstanceSpec.scala

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

Co-authored-by: Jack Koenig <koenig@sifive.com>

Co-authored-by: Megan Wachs <megan@sifive.com>
Co-authored-by: Jack Koenig <koenig@sifive.com>

Use Treadle (on pull requests only) to speed up CI

Treadle will be used as the "defaultBackend" when the environment
variable CHISEL3_CI_USE_TREADLE is set. The intent is to set this
variable during CI for pre-merge CI (aka on pull requests).

The command line options for CIRCT's firtool command have been updated.

Previously, failed jobs in the CI matrix would cause the sentinel job
(all-tests-passed) to be skipped, which for purposes of Github Actions
branch protection would count as "success". This allowed PRs with
failing CI to be merged. This new approach which uses two sentinel jobs
should not suffer from this same issue.

This enables emission of modules that serialize to >2 GiB of .fir text.

* Cleanup Cookbook and printing docs
* Format specifiers are actually concise now

Co-authored-by: Megan Wachs <megan@sifive.com>

Referenced to: chipsalliance/chisel3#2728