Fix performance bug in GenASM.

It was going through missingHook looking for android classes
every time something was compiled, which means four failing
missingHook calls for every line in the repl.

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

@@ -46,6 +46,16 @@ abstract class GenASM extends SubComponent with BytecodeWriters {
   private def getFile(sym: Symbol, clsName: String, suffix: String): AbstractFile =
     getFile(outputDirectory(sym), clsName, suffix)
 
+  /** From the reference documentation of the Android SDK:
+   *  The `Parcelable` interface identifies classes whose instances can be written to and restored from a `Parcel`.
+   *  Classes implementing the `Parcelable` interface must also have a static field called `CREATOR`,
+   *  which is an object implementing the `Parcelable.Creator` interface.
+   */
+  private val androidFieldName = newTermName("CREATOR")
+
+  private lazy val AndroidParcelableInterface = rootMirror.getClassIfDefined("android.os.Parcelable")
+  private lazy val AndroidCreatorClass        = rootMirror.getClassIfDefined("android.os.Parcelable$Creator")
+
   /** JVM code generation phase
    */
   class AsmPhase(prev: Phase) extends ICodePhase(prev) {
@@ -1202,16 +1212,6 @@ abstract class GenASM extends SubComponent with BytecodeWriters {
   trait JAndroidBuilder {
     self: JPlainBuilder =>
 
-    /** From the reference documentation of the Android SDK:
-     *  The `Parcelable` interface identifies classes whose instances can be written to and restored from a `Parcel`.
-     *  Classes implementing the `Parcelable` interface must also have a static field called `CREATOR`,
-     *  which is an object implementing the `Parcelable.Creator` interface.
-     */
-    private val androidFieldName = newTermName("CREATOR")
-
-    private lazy val AndroidParcelableInterface = rootMirror.getClassIfDefined("android.os.Parcelable")
-    private lazy val AndroidCreatorClass        = rootMirror.getClassIfDefined("android.os.Parcelable$Creator")
-
     def isAndroidParcelableClass(sym: Symbol) =
       (AndroidParcelableInterface != NoSymbol) &&
       (sym.parentSymbols contains AndroidParcelableInterface)

src/reflect/scala/reflect/internal/Mirrors.scala

@@ -79,7 +79,9 @@ trait Mirrors extends api.Mirrors {
 
     protected def universeMissingHook(owner: Symbol, name: Name): Symbol = thisUniverse.missingHook(owner, name)
 
-    private[scala] def missingHook(owner: Symbol, name: Name): Symbol = mirrorMissingHook(owner, name) orElse universeMissingHook(owner, name)
+    private[scala] def missingHook(owner: Symbol, name: Name): Symbol = logResult(s"missingHook($owner, $name)")(
+      mirrorMissingHook(owner, name) orElse universeMissingHook(owner, name)
+    )
 
     // todo: get rid of most the methods here and keep just staticClass/Module/Package