use MaterializedFrame in places where frames will be materialized eventually anyway

...fle.r.engine/src/com/oracle/truffle/r/engine/REngine.java

...c/com/oracle/truffle/r/nodes/builtin/RBuiltinPackage.java

.../com/oracle/truffle/r/nodes/builtin/RBuiltinPackages.java

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

...om/oracle/truffle/r/nodes/builtin/base/EvalFunctions.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Order.java

...e/truffle/r/nodes/expressions/ExpressionExecutorNode.java

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

...le.r.runtime/src/com/oracle/truffle/r/runtime/RError.java

...ntime/src/com/oracle/truffle/r/runtime/data/RPromise.java

...me/src/com/oracle/truffle/r/runtime/env/REnvironment.java

...ffle.r.shell/src/com/oracle/truffle/r/shell/RCommand.java