[GR-4099] Fixes towards running ggplot2 (2).

...cle/truffle/r/nodes/builtin/base/S3DispatchFunctions.java

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

...ruffle/r/nodes/access/vector/CachedExtractVectorNode.java

.../src/com/oracle/truffle/r/nodes/builtin/InternalNode.java

...m/oracle/truffle/r/nodes/function/ClassHierarchyNode.java

.../truffle/r/nodes/function/ImplicitClassHierarchyNode.java

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

...c/com/oracle/truffle/r/test/functions/S3/R/numericTypes.R

.../oracle/truffle/r/test/library/base/TestEnvironments.java