Optimization: reduce creations of FlagConjunction

Author: odersky

compiler/src/dotty/tools/backend/jvm/DottyBackendInterface.scala

@@ -477,7 +477,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
     // unrelated change.
        ctx.base.settings.YnoGenericSig.value
     || sym.is(Flags.Artifact)
-    || sym.is(Flags.allOf(Flags.Method, Flags.Lifted))
+    || sym.is(Flags.LiftedMethod)
     || sym.is(Flags.Bridge)
   )
 

compiler/src/dotty/tools/dotc/core/Flags.scala

@@ -698,6 +698,8 @@ object Flags {
   /** Labeled protected[this] */
   final val ProtectedLocal: FlagConjunction = allOf(Protected, Local)
 
+  final val LiftedMethod: FlagConjunction = allOf(Lifted, Method)
+
   /** Java symbol which is `protected` and `static` */
   final val StaticProtected: FlagConjunction = allOf(JavaDefined, Protected, JavaStatic)
 

compiler/src/dotty/tools/dotc/typer/Applications.scala

@@ -1159,7 +1159,7 @@ trait Applications extends Compatibility { self: Typer with Dynamic =>
    *  result matching `resultType`?
    */
   def hasExtensionMethod(tp: Type, name: TermName, argType: Type, resultType: Type)(implicit ctx: Context) = {
-    val mbr = tp.memberBasedOnFlags(name, required = allOf(ExtensionMethod))
+    val mbr = tp.memberBasedOnFlags(name, required = ExtensionMethod)
     mbr.exists && isApplicable(tp.select(name, mbr), argType :: Nil, resultType)
   }
 

compiler/src/dotty/tools/dotc/typer/Implicits.scala

@@ -143,7 +143,7 @@ object Implicits {
                   tpw.derivesFrom(defn.Predef_Conforms) && ref.symbol != defn.Predef_conforms
               val hasExtensions = resType match {
                 case SelectionProto(name, _, _, _) =>
-                  tpw.memberBasedOnFlags(name, required = allOf(ExtensionMethod)).exists
+                  tpw.memberBasedOnFlags(name, required = ExtensionMethod).exists
                 case _ => false
               }
               val conversionKind =