Merge branch 'master' into feature/ffi

...c/com/oracle/truffle/r/engine/interop/DLLDotSymbolMR.java

...ne/src/com/oracle/truffle/r/engine/interop/DLLInfoMR.java

...c/com/oracle/truffle/r/engine/interop/RExternalPtrMR.java

...e/truffle/r/engine/interop/RForeignAccessFactoryImpl.java

...ne/src/com/oracle/truffle/r/engine/interop/RSymbolMR.java

.../com/oracle/truffle/r/engine/interop/RUnboundValueMR.java

...ibrary/src/com/oracle/truffle/r/library/methods/Slot.java

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

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

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

.../truffle/r/nodes/objects/CollectGenericArgumentsNode.java

...c/com/oracle/truffle/r/nodes/objects/DispatchGeneric.java

...s/src/com/oracle/truffle/r/nodes/objects/GetPrimName.java

...es/src/com/oracle/truffle/r/nodes/objects/LoadMethod.java

...acle/truffle/r/runtime/context/RForeignAccessFactory.java