refactor definitions

Author: bishabosha

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

@@ -357,7 +357,7 @@ class Definitions {
   @tu lazy val ScalaRuntimeModule: Symbol = ctx.requiredModule("scala.runtime.ScalaRunTime")
     def runtimeMethodRef(name: PreName): TermRef = ScalaRuntimeModule.requiredMethodRef(name)
     def ScalaRuntime_drop: Symbol = runtimeMethodRef(nme.drop).symbol
-    @tu lazy val ScalaRuntime__hashCode: Symbol = runtimeMethodRef("_hashCode").symbol
+    @tu lazy val ScalaRuntime__hashCode: Symbol = ScalaRuntimeModule.requiredMethod(nme._hashCode_)
 
   @tu lazy val BoxesRunTimeModule: Symbol = ctx.requiredModule("scala.runtime.BoxesRunTime")
   @tu lazy val ScalaStaticsModule: Symbol = ctx.requiredModule("scala.runtime.Statics")

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

@@ -449,6 +449,7 @@ object StdNames {
     val getOrElse: N            = "getOrElse"
     val hasNext: N              = "hasNext"
     val hashCode_ : N           = "hashCode"
+    val _hashCode_ : N          = "_hashCode"
     val hash_ : N               = "hash"
     val head: N                 = "head"
     val higherKinds: N          = "higherKinds"

compiler/src/dotty/tools/dotc/transform/SyntheticMembers.scala

@@ -258,10 +258,10 @@ class SyntheticMembers(thisPhase: DenotTransformer) {
     def chooseHashcode(implicit ctx: Context) = {
       if (clazz.is(ModuleClass))
         Literal(Constant(clazz.name.stripModuleClassSuffix.toString.hashCode))
-      else if (accessors `exists` (_.info.finalResultType.classSymbol.isPrimitiveValueClass))
+      else if (accessors.exists(_.info.finalResultType.classSymbol.isPrimitiveValueClass))
         caseHashCodeBody
       else
-        ref(defn.ScalaRuntimeModule).select(defn.ScalaRuntime__hashCode).appliedTo(This(clazz))
+        ref(defn.ScalaRuntime__hashCode).appliedTo(This(clazz))
     }
 
     /** The class