Implemented closures for RLanguage.

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

...rc/com/oracle/truffle/r/engine/RRuntimeASTAccessImpl.java

...e/src/com/oracle/truffle/r/engine/interop/RPromiseMR.java

...oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java

...oracle/truffle/r/library/methods/MethodsListDispatch.java

...y/src/com/oracle/truffle/r/library/stats/deriv/Deriv.java

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

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Call.java

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

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

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

...truffle/r/nodes/builtin/base/HiddenInternalFunctions.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Quote.java

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Slot.java

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

.../com/oracle/truffle/r/nodes/builtin/base/infix/Tilde.java

.../com/oracle/truffle/r/nodes/builtin/fastr/FastRTrace.java

...odes/src/com/oracle/truffle/r/nodes/InlineCacheNodes.java

...fle.r.nodes/src/com/oracle/truffle/r/nodes/RASTUtils.java

...com/oracle/truffle/r/nodes/access/AccessArgumentNode.java