[GR-2798] Fix attribute handling in isfinite/isinfinite functions.

...cle/truffle/r/nodes/builtin/base/DuplicatedFunctions.java

...racle/truffle/r/nodes/builtin/base/IsFiniteFunctions.java

...src/com/oracle/truffle/r/nodes/access/AccessSlotNode.java

...odes/src/com/oracle/truffle/r/nodes/unary/TypeofNode.java

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

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

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

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