remove obsolete EmptyTypeSystemFlatLayout

...om/oracle/truffle/r/library/stats/RandFunctionsNodes.java

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

.../src/com/oracle/truffle/r/nodes/builtin/base/Sample2.java

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

...racle/truffle/r/nodes/builtin/base/infix/AccessField.java

...cle/truffle/r/nodes/builtin/base/infix/SpecialsUtils.java

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

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

...racle/truffle/r/nodes/builtin/base/infix/UpdateField.java

...e/truffle/r/nodes/builtin/base/infix/UpdateSubscript.java

...acle/truffle/r/nodes/builtin/base/infix/UpdateSubset.java

...com/oracle/truffle/r/nodes/EmptyTypeSystemFlatLayout.java

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

...cle/truffle/r/nodes/access/vector/ExtractListElement.java

...racle/truffle/r/nodes/attributes/AttributeAccessNode.java

...ffle/r/nodes/attributes/AttributeIterativeAccessNode.java

...racle/truffle/r/nodes/binary/BinaryArithmeticSpecial.java

...m/oracle/truffle/r/nodes/binary/BinaryBooleanSpecial.java

...c/com/oracle/truffle/r/nodes/control/ReplacementNode.java

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