enable passing tests

...e/truffle/r/nodes/builtin/base/printer/VectorPrinter.java

.../com/oracle/truffle/r/test/builtins/TestBuiltin_isna.java

...om/oracle/truffle/r/test/builtins/TestBuiltin_isnull.java

...cle/truffle/r/test/builtins/TestBuiltin_printdefault.java

...oracle/truffle/r/test/builtins/TestBuiltin_serialize.java

.../com/oracle/truffle/r/test/builtins/TestMiscBuiltins.java

.../src/com/oracle/truffle/r/test/generate/FastRSession.java

...cle/truffle/r/test/library/base/TestSimpleAttributes.java