fix visibility of some builtins and enable passing tests

...m/oracle/truffle/r/nodes/builtin/base/DebugFunctions.java

...com/oracle/truffle/r/nodes/builtin/base/EnvFunctions.java

...c/com/oracle/truffle/r/nodes/builtin/base/UpdateAttr.java

...oracle/truffle/r/nodes/builtin/base/UpdateAttributes.java

...rc/com/oracle/truffle/r/nodes/builtin/base/UpdateDim.java

...m/oracle/truffle/r/nodes/builtin/base/UpdateDimNames.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

...racle/truffle/r/test/builtins/TestBuiltin_attrassign.java

...truffle/r/test/builtins/TestBuiltin_attributesassign.java

...ruffle/r/test/builtins/TestBuiltin_attributesassign_.java

...racle/truffle/r/test/builtins/TestBuiltin_copyDFattr.java

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

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

...rc/com/oracle/truffle/r/test/builtins/TestBuiltin_qr.java

...rc/com/oracle/truffle/r/test/functions/TestFunctions.java

...rc/com/oracle/truffle/r/test/library/stats/TestStats.java