Disable classes referencing Global in files needed for the backend

These classes cannot be compiled as part of dotty since we don't compile
dotty, but we still need to compile the files containing these classes
because their companion objects are referenced in other parts of the
backend.

Author: smarter

src/compiler/scala/tools/nsc/backend/ScalaPrimitives.scala

@@ -26,6 +26,7 @@ import scala.collection.{ mutable, immutable }
  *
  * Inspired from the `scalac` compiler.
  */
+/*
 abstract class ScalaPrimitives {
   val global: Global
 
@@ -407,6 +408,7 @@ abstract class ScalaPrimitives {
   }
 
 }
+*/
 
 object ScalaPrimitives {
   // Arithmetic unary operations

src/compiler/scala/tools/nsc/backend/icode/Opcodes.scala

@@ -64,6 +64,7 @@ import Primitives._
  * erased types of Scala and references Symbols to refer named entities
  * in the source files.
  */
+/*
 trait Opcodes { self: ICodes =>
   import global.{Symbol, NoSymbol, Name, Constant}
   import Opcodes._
@@ -719,6 +720,7 @@ trait Opcodes { self: ICodes =>
     }
   }
 }
+*/
 
 object Opcodes{
 

src/compiler/scala/tools/nsc/backend/icode/Primitives.scala

@@ -10,6 +10,7 @@ package icode
 
 import java.io.PrintWriter
 
+/*
 trait Primitives { self: ICodes =>
   import Primitives._
 
@@ -59,6 +60,7 @@ trait Primitives { self: ICodes =>
   // jvm  : It should call the appropiate 'append' method on StringBuffer
   case class StringConcat(el: TypeKind) extends Primitive
 }
+*/
 
 object Primitives {
   /** This class represents a primitive operation. */
@@ -244,4 +246,4 @@ object Primitives {
 
   /** A comparison operation with +1 default for NaNs */
   case object CMPG extends ComparisonOp
-}
+}

src/compiler/scala/tools/nsc/backend/jvm/BCodeAsmCommon.scala

@@ -6,7 +6,6 @@
 package scala.tools.nsc.backend.jvm
 
 import scala.reflect.internal.AnnotationInfos
-import scala.tools.nsc.Global
 
 /**
  * This trait contains code shared between GenBCode and GenASM that depends on types defined in

src/compiler/scala/tools/nsc/backend/jvm/BCodeSkelBuilder.scala

@@ -10,7 +10,6 @@ package backend
 package jvm
 
 import scala.collection.{ mutable, immutable }
-import scala.tools.nsc.symtab._
 import scala.annotation.switch
 
 import scala.tools.asm

src/compiler/scala/tools/nsc/backend/jvm/BackendInterface.scala

@@ -3,7 +3,6 @@ package scala.tools.nsc.backend.jvm
 import scala.collection.generic.Clearable
 import scala.reflect.ClassTag
 import scala.reflect.io.AbstractFile
-import scala.tools.nsc.Global
 import scala.language.implicitConversions
 import scala.tools.asm
 

src/compiler/scala/tools/nsc/backend/jvm/GenBCode.scala

@@ -14,6 +14,7 @@ import scala.reflect.internal.util.Statistics
 
 import scala.tools.asm
 import scala.tools.asm.tree.ClassNode
+/*
 import scala.tools.nsc.backend.jvm.opt.LocalOpt
 
 /*
@@ -409,6 +410,7 @@ abstract class GenBCode extends SubComponent with BCodeSyncAndTry {
   } // end of class BCodePhase
 
 } // end of class GenBCode
+*/
 
 object GenBCode {
   def mkFlags(args: Int*) = args.foldLeft(0)(_ | _)