restore compat for PathResolver, ClassPathFactory constructors

restore source compat and bincompat

small followup to scala#7712. the community build found that a couple of
projects (mima, classpath-shrinker) were using the old
constructors. since it's easy to do, let's keep both source compat
(with the default arguments) and bincompat (with the extra
constructors, which we can toss for 2.13)

src/compiler/scala/tools/nsc/classpath/ClassPathFactory.scala

@@ -22,7 +22,11 @@ import scala.tools.nsc.util.ClassPath
  * Provides factory methods for classpath. When creating classpath instances for a given path,
  * it uses proper type of classpath depending on a types of particular files containing sources or classes.
  */
-class ClassPathFactory(settings: Settings, closeableRegistry: CloseableRegistry) {
+class ClassPathFactory(settings: Settings, closeableRegistry: CloseableRegistry = new CloseableRegistry) {
+
+  @deprecated("for bincompat in 2.12.x series", "2.12.9")  // TODO remove from 2.13.x
+  def this(settings: Settings) = this(settings, new CloseableRegistry)
+
   /**
     * Create a new classpath based on the abstract file.
     */
@@ -78,7 +82,10 @@ class ClassPathFactory(settings: Settings, closeableRegistry: CloseableRegistry)
 }
 
 object ClassPathFactory {
-  def newClassPath(file: AbstractFile, settings: Settings, closeableRegistry: CloseableRegistry): ClassPath = file match {
+  @deprecated("for bincompat in 2.12.x series", "2.12.9")  // TODO remove from 2.13.x
+  def newClassPath(file: AbstractFile, settings: Settings): ClassPath =
+    newClassPath(file, settings, new CloseableRegistry)
+  def newClassPath(file: AbstractFile, settings: Settings, closeableRegistry: CloseableRegistry = new CloseableRegistry): ClassPath = file match {
     case vd: VirtualDirectory => VirtualDirectoryClassPath(vd)
     case _ =>
       if (file.isJarOrZip)

src/compiler/scala/tools/util/PathResolver.scala

@@ -206,7 +206,11 @@ object PathResolver {
     }
 }
 
-final class PathResolver(settings: Settings, closeableRegistry: CloseableRegistry) {
+final class PathResolver(settings: Settings, closeableRegistry: CloseableRegistry = new CloseableRegistry) {
+
+  @deprecated("for bincompat in 2.12.x series", "2.12.9")  // TODO remove from 2.13.x
+  def this(settings: Settings) = this(settings, new CloseableRegistry)
+
   private val classPathFactory = new ClassPathFactory(settings, closeableRegistry)
 
   import PathResolver.{ AsLines, Defaults, ppcp }