rtlil: remove textual RTLIL reference tests for ease of maintenance

Author: widlarizer

tests/rtlil/roundtrip-text.ref.il

@@ -17,7 +17,6 @@ remove_empty_lines temp/roundtrip-text.write.il
 # Trim first line ("Generated by Yosys ...")
 tail -n +2 temp/roundtrip-text.write.il > temp/roundtrip-text.write-nogen.il
 diff temp/roundtrip-text.dump.il temp/roundtrip-text.write-nogen.il
-diff temp/roundtrip-text.dump.il roundtrip-text.ref.il
 
 # Loading and writing it out again doesn't change the RTLIL
 $YS -p "read_rtlil temp/roundtrip-text.dump.il; write_rtlil temp/roundtrip-text.reload.il"
@@ -30,10 +29,3 @@ $YS --hash-seed=2345678 -p "read_rtlil temp/roundtrip-text.dump.il; write_rtlil
 remove_empty_lines temp/roundtrip-text.reload-hash.il
 tail -n +2 temp/roundtrip-text.reload-hash.il > temp/roundtrip-text.reload-hash-nogen.il
 diff temp/roundtrip-text.dump.il temp/roundtrip-text.reload-hash-nogen.il
-
-echo "Without ABC, we don't get any irreproducibility and can pin that"
-echo "Has this test case started failing for you? Consider updating the reference"
-$YS -p "read_verilog -sv everything.v; synth -relativeshare -noabc; write_rtlil temp/roundtrip-text.synth.il"
-remove_empty_lines temp/roundtrip-text.synth.il
-tail -n +2 temp/roundtrip-text.synth.il > temp/roundtrip-text.synth-nogen.il
-diff temp/roundtrip-text.synth-nogen.il roundtrip-text.synth.ref.il