8028563: Remove javac support for 6/1.6 source and target values
Reviewed-by: jjg, erikj, henryjen
BadTest.java:18:50: compiler.err.prob.found.req: (compiler.misc.inconvertible.types: List<java.lang.Object>, List<Cell<java.lang.String>>)
BadTest.java:22:48: compiler.err.prob.found.req: (compiler.misc.inconvertible.types: List<java.lang.Object>, List<java.lang.String>)
BadTest.java:23:54: compiler.err.prob.found.req: (compiler.misc.inconvertible.types: List<java.lang.Object>, List<Cell<java.lang.String>>)
BadTest.java:25:53: compiler.err.illegal.generic.type.for.instof
4 errors