8147930: Langtools test Makefile still requires special make in Cygwin Reviewed-by: ihse

8136494: Update "@since 1.9" to "@since 9" to match java.version.specification Reviewed-by: alanb, chegar, lancea

8147546: regression when type-checking generic calls inside nested declarations occurring in method context Summary: Attr.visitClassDef should set a temporary ArgumentAttr cache when in speculative mode Reviewed-by: vromero

8147493: regression when type-checking unchecked method calls Summary: Shared warner in Attr.checkMethod leads to spurious inference errors Reviewed-by: vromero