DNM: Use 4 cores for kokoro weekly#1191

litghost wants to merge 3 commits intoverilog-to-routing:masterverilog-to-routing/vtr-verilog-to-routing:masterfrom

litghost:faster_weekly_4_corelitghost/vtr-verilog-to-routing:faster_weekly_4_coreCopy head branch name to clipboard