[HOT-FIX] Recover some deprecations for 2.10 compatibility.

## What changes were proposed in this pull request?

#11479 [SPARK-13627] broke 2.10 compatibility: [2.10-Build](https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Compile/job/spark-master-compile-maven-scala-2.10/292/console)
At this moment, we need to support both 2.10 and 2.11.
This PR recovers some deprecated methods which were replace by [SPARK-13627].

## How was this patch tested?

Jenkins build: Both 2.10, 2.11.

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #11488 from dongjoon-hyun/hotfix_compatibility_with_2.10.

examples/src/main/scala/org/apache/spark/examples/mllib/AbstractParams.scala

@@ -38,7 +38,7 @@ abstract class AbstractParams[T: TypeTag] {
    */
   override def toString: String = {
     val tpe = tag.tpe
-    val allAccessors = tpe.decls.collect {
+    val allAccessors = tpe.declarations.collect {
       case m: MethodSymbol if m.isCaseAccessor => m
     }
     val mirror = runtimeMirror(getClass.getClassLoader)

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala

@@ -774,9 +774,9 @@ trait ScalaReflection {
   }
 
   protected def constructParams(tpe: Type): Seq[Symbol] = {
-    val constructorSymbol = tpe.member(termNames.CONSTRUCTOR)
+    val constructorSymbol = tpe.member(nme.CONSTRUCTOR)
     val params = if (constructorSymbol.isMethod) {
-      constructorSymbol.asMethod.paramLists
+      constructorSymbol.asMethod.paramss
     } else {
       // Find the primary constructor, and use its parameter ordering.
       val primaryConstructorSymbol: Option[Symbol] = constructorSymbol.asTerm.alternatives.find(
@@ -784,7 +784,7 @@ trait ScalaReflection {
       if (primaryConstructorSymbol.isEmpty) {
         sys.error("Internal SQL error: Product object did not have a primary constructor.")
       } else {
-        primaryConstructorSymbol.get.asMethod.paramLists
+        primaryConstructorSymbol.get.asMethod.paramss
       }
     }
     params.flatten

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/package.scala

@@ -51,7 +51,7 @@ package object codegen {
       val classLoader =
         generatedClass
           .getClassLoader
-          .asInstanceOf[scala.reflect.internal.util.AbstractFileClassLoader]
+          .asInstanceOf[scala.tools.nsc.interpreter.AbstractFileClassLoader]
       val generatedBytes = classLoader.classBytes(generatedClass.getName)
 
       val packageDir = new java.io.File(dumpDirectory, generatedClass.getPackage.getName)

tools/src/main/scala/org/apache/spark/tools/GenerateMIMAIgnore.scala

@@ -44,10 +44,10 @@ object GenerateMIMAIgnore {
 
 
   private def isDeveloperApi(sym: unv.Symbol) =
-    sym.annotations.exists(_.tree.tpe =:= unv.typeOf[org.apache.spark.annotation.DeveloperApi])
+    sym.annotations.exists(_.tpe =:= unv.typeOf[org.apache.spark.annotation.DeveloperApi])
 
   private def isExperimental(sym: unv.Symbol) =
-    sym.annotations.exists(_.tree.tpe =:= unv.typeOf[org.apache.spark.annotation.Experimental])
+    sym.annotations.exists(_.tpe =:= unv.typeOf[org.apache.spark.annotation.Experimental])
 
 
   private def isPackagePrivate(sym: unv.Symbol) =