Summary: Restructure test to use the logic from the JDK 9 version.
Reviewed-by: jjg

Reviewed-by: tbell, iris

Reviewed-by: mcimadamore

Reviewed-by: ksrini, yhuang

Reviewed-by: jjg

Reviewed-by: mcimadamore

Summary: Wrong method type used in AmbiguousError.mergeAbstracts
Reviewed-by: jlahoda

8058227: Debugger has no access to outer variables inside Lambda
Summary: Put local variables captured by lambda into the lambda method's LocalVariableTable.
Reviewed-by: mcimadamore, rfield