Polishing and better documentation of Names.scala

# Conflicts:
#	compiler/src/dotty/tools/dotc/core/Names.scala

Author: odersky

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

@@ -634,7 +634,7 @@ class DottyBackendInterface(outputDirectory: AbstractFile, val superCallsMap: Ma
         toDenot(sym)(shiftedContext).isStatic(shiftedContext)
       }
 
-    def isStaticConstructor: Boolean = (isStaticMember && isClassConstructor) || (sym.name eq core.Names.STATIC_CONSTRUCTOR)
+    def isStaticConstructor: Boolean = (isStaticMember && isClassConstructor) || (sym.name eq nme.STATIC_CONSTRUCTOR)
 
 
     // navigation

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

@@ -254,7 +254,7 @@ object NameKinds {
       if (i > 0) {
         val index = name.drop(i).toString.toInt - 1
         var original = name.take(i - str.DEFAULT_GETTER.length).asTermName
-        if (original == nme.DEFAULT_GETTER_INIT) original = Names.CONSTRUCTOR
+        if (original == nme.DEFAULT_GETTER_INIT) original = nme.CONSTRUCTOR
         apply(original, index)
       }
       else name

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

@@ -100,8 +100,10 @@ object NameOps {
      *  it is also called from the backend.
      */
     def stripModuleClassSuffix: N = likeSpaced {
-      val semName =
-        if (name.isSimple && name.endsWith("$")) name.unmangleClassName else name
+      val semName = name.toTermName match {
+        case name: SimpleTermName if name.endsWith("$") => name.unmangleClassName
+        case _ => name
+      }
       semName.exclude(ModuleClassName)
     }