vtr-verilog-to-routing
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[WIP] Thread-safe re-clustering API and the connection-driven IIP
In this PR, the re-clustering API is extended to be thread-safe. Moreover, some bugs in the API are fixed.
Then, the API is utilized to optimize connection-driven packing using iterative improvement packing IIP. Currently working on extending it to be timing driven.
@amin1377
@MohamedElgammal : should these thread-safe improvements be merged?