turn RRuntime.TYPE constants into enumeration

...fle.r.engine/src/com/oracle/truffle/r/engine/REngine.java

...om/oracle/truffle/r/nodes/builtin/base/AnyDuplicated.java

...src/com/oracle/truffle/r/nodes/builtin/base/AsVector.java

...acle/truffle/r/nodes/builtin/base/ClassHierarchyNode.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/DoCall.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/Exists.java

...ltin/src/com/oracle/truffle/r/nodes/builtin/base/Get.java

...src/com/oracle/truffle/r/nodes/builtin/base/GetClass.java

...src/com/oracle/truffle/r/nodes/builtin/base/IsVector.java

...src/com/oracle/truffle/r/nodes/builtin/base/MatchFun.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/Typeof.java

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

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

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

...n/src/com/oracle/truffle/r/nodes/builtin/base/Vector.java

...truffle.r.nodes/src/com/oracle/truffle/r/nodes/RNode.java

...nodes/src/com/oracle/truffle/r/nodes/RTruffleVisitor.java

...ruffle.r.nodes/src/com/oracle/truffle/r/nodes/RTypes.java

...c/com/oracle/truffle/r/nodes/access/ReadVariableNode.java

...cle/truffle/r/nodes/access/ReadVariadicComponentNode.java