Also move some ScalaDoc defines to Bits from Num so they are available
there, and define sumWidthInt.

Change ChiselSim to stop using undocumented CIRCT-generated filelists to
know what files to include in simulator compile.  Specifically, don't rely
on the existence of `filelist.f` or `firrtl_black_box_resource_files.f`.

This is needed because the latter file was removed from (the unreleased)
CIRCT 1.125.0 [[1]] for reasons that it wasn't supposed to be load
bearing.  Removing the reliance on the former is just good to do.

Note: this may result in some breakages as users may have been
inadvertently relying on this behavior to exclude some generated files
from their compilation.  E.g., a user could generate some Chisel-time
metadata file which gets put into the build area, but then is excluded
from the compile.  To work around this, users should dump these files in
an alternative area.

[1]: llvm/circt@c7e10d7

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

Change the logic used for determining which files to incldue from a
blocklist to an allowlist.  The blocklist approach is problematic as
sometimes users will generate odd files (e.g., '.graphml') and these need
to be excluded from the build.  It is easier to just include reasonable
files which is all Verilog and C++ files.

This is an imperfect solution and should be changed in the future to
either: (1) allow customization of this, (2) split the Chisel build
directory from the FIRRTL build directory, or (3) use CIRCT tooling to
query the MLIR to get the full list of files that should be included.

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

Remove a usage of an undocumented filelist that has been removed from
CIRCT 1.125.0.

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

This is an automated commit generated by the `circt/update-circt` GitHub
Action.

Co-authored-by: chiselbot <chiselbot@users.noreply.github.com>

This is an automated commit generated by the `circt/update-circt` GitHub
Action.

Co-authored-by: chiselbot <chiselbot@users.noreply.github.com>