Add core-lambda-stubs to default classpath for target libs compiling using javac

In order to compile lambda code javac requires various invokedynamic-
related classes to be present. This change adds stubs needed for
javac to compile lambdas.

Bug: 27475234
Bug: 26753820
Bug: 26604040
(cherry picked from commit b08544ed)

Change-Id: Ie82600da21a9dbe2348e96aef1c5e966a7a1ef5a