[GR-2738] Various fixes for packages.

...l/src/com/oracle/truffle/r/ffi/impl/nodes/RfEvalNode.java

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

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

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

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

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

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

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

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

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

...uffle/r/nodes/access/variables/LocalReadVariableNode.java

...acle/truffle/r/nodes/function/FunctionExpressionNode.java

.../oracle/truffle/r/nodes/function/GetBaseEnvFrameNode.java

...om/oracle/truffle/r/nodes/function/PromiseHelperNode.java

...es/src/com/oracle/truffle/r/nodes/function/RCallNode.java

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

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

...ser/src/com/oracle/truffle/r/parser/ParserGeneration.java

...acle.truffle.r.parser/src/com/oracle/truffle/r/parser/R.g

...me/src/com/oracle/truffle/r/runtime/context/RContext.java