centralize the use of NodeUtil.cloneNode in RASTUtils

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

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

...nodes/src/com/oracle/truffle/r/nodes/InlineCacheNode.java

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

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

...le/truffle/r/nodes/access/variables/ReadVariableNode.java

.../src/com/oracle/truffle/r/nodes/function/PromiseNode.java

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