Merge remote-tracking branch 'origin/xaig' into xc7mux

diff --cc CHANGELOG
index 24c81be6ee1c27eaaa06abdc67cbf8c77ac5f7a4,fd72d57028e2aae92ccce1cc3c587b982a0bfa51..51ff4e1a4aa0b8525926c9f14d60daec982dcbf2
--- 1/CHANGELOG
--- 2/CHANGELOG
+++ b/CHANGELOG
@@@ -22,11 -20,8 +22,11 @@@ Yosys 0.8 .. Yosys 0.8-de
      - Added "abc9" pass for timing-aware techmapping (experimental, FPGA only, no FFs)
      - Added "synth_xilinx -abc9" (experimental)
      - Added "synth_ice40 -abc9" (experimental)
+     - Added "synth -abc9" (experimental)
      - Extended "muxcover -mux{4,8,16}=<cost>"
-     - Added "synth -abc9" (experimental)
 +    - Fixed sign extension of unsized constants with 'bx and 'bz MSB
 +    - Added "muxpack" pass
 +    - "synth_xilinx" to now infer wide multiplexers (-nomux to disable)
  
  
  Yosys 0.7 .. Yosys 0.8