[tool,check_dif_status] Better rep of DIF progress This commit enhances the check_dif_status.py script by allowing the user to pass the top level HJSon file, from which we can extract the full list of blocks in the design. This is better than the existing approach where the list of available blocks is computed by looking at the sources in the DIF area. If the DIF sources dont even exist, then it does not get accounted for. This commit adds a `--top-hjson` switch, which is used to pass the top level HJson file (relative to repo_top). If passed, it invokes the `topgen.py` script to get the list of IP blocks in the design. If not passed, it falls back to the current behavior, while throwing a warning stating the the table may not present the full picture. This switch is thus optional (but highly recommended). Signed-off-by: Srikrishna Iyer <sriyer@google.com>
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