Emit the ScalaInlineInfo attribute under GenASM

The goal of this commit is to allow the new inliner (in GenBCode,
coming soon) to inline methods generated by the GenASM backend of
2.11.6.

The ScalaInlineInfo attribute is added to every classfile generated
by GenASM. It contains metadata about the class and its methods that
will be used by the new inliner.

Storing this metadata to the classfile prevents the need to look up a
class symbol for a certain class file name, a process that is known to
be brittle due to name mangling. Also, some symbols are not exactly
the same when originating in a class being compiled or an unpickled
one. For example, method symbols for mixed-in members are only added
to classes being compiled.

The classfile attribute is relatively small, because all strings it
references (class internal names, method names, method descriptors)
would exist anyway in the constant pool. It just adds a few references
and bits for each method in the classfile.

Jar sizes before:

  480142 scala-actors.jar
15531408 scala-compiler.jar
 5543249 scala-library.jar
 4663078 scala-reflect.jar
  785953 scalap.jar

After:

  490491 scala-actors.jar   (102.1%)
15865500 scala-compiler.jar (102.1%)
 5722504 scala-library.jar  (103.2%)
 4788370 scala-reflect.jar  (102.7%)
  805890 scalap.jar         (102.5%)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala b/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
index f786ffb8f3..3591372bbe 100644
--- a/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
+++ b/src/compiler/scala/tools/nsc/transform/AddInterfaces.scala
@@ -55,7 +55,7 @@ abstract class AddInterfaces extends InfoTransform { self: Erasure =>
   )
 
   /** Does symbol need an implementation method? */
-  private def needsImplMethod(sym: Symbol) = (
+  def needsImplMethod(sym: Symbol) = (
        sym.isMethod
     && isInterfaceMember(sym)
     && (!sym.hasFlag(DEFERRED | SUPERACCESSOR) || (sym hasFlag lateDEFERRED))