Remove postfixOps from dotty benchmark options

Author: mbovel

bench/profiles/projects.yml

@@ -26,7 +26,7 @@ charts:
 
 scripts:
     dotty:
-        - measure -feature -deprecation -unchecked -Xfatal-warnings -encoding UTF8 -language:existentials,higherKinds,implicitConversions,postfixOps -Yexplicit-nulls -with-compiler $(find $PROG_HOME/dotty/compiler/src/dotty -name *.scala -o -name *.java)
+        - measure -feature -deprecation -unchecked -Xfatal-warnings -encoding UTF8 -language:existentials,higherKinds,implicitConversions -Yexplicit-nulls -with-compiler $(find $PROG_HOME/dotty/compiler/src/dotty -name *.scala -o -name *.java)
 
     re2s:
         - measure $(find $PROG_HOME/tests/re2s/src -name *.scala)

project/Build.scala

@@ -770,6 +770,7 @@ object Build {
       )
     },
 
+    // Note: bench/profiles/projects.yml should be updated accordingly.
     Compile / scalacOptions ++= Seq("-Yexplicit-nulls"),
 
     repl := (Compile / console).value,