check completeness of result vectors

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

...ptions/src/com/oracle/truffle/r/options/FastROptions.java

...src/com/oracle/truffle/r/runtime/data/RComplexVector.java

.../src/com/oracle/truffle/r/runtime/data/RDoubleVector.java

...ime/src/com/oracle/truffle/r/runtime/data/RIntVector.java

....runtime/src/com/oracle/truffle/r/runtime/data/RList.java

.../truffle/r/runtime/data/model/RAbstractComplexVector.java

...e/truffle/r/runtime/data/model/RAbstractDoubleVector.java

...acle/truffle/r/runtime/data/model/RAbstractIntVector.java

.../truffle/r/runtime/data/model/RAbstractLogicalVector.java

...acle/truffle/r/runtime/data/model/RAbstractRawVector.java

...e/truffle/r/runtime/data/model/RAbstractStringVector.java

.../oracle/truffle/r/runtime/data/model/RAbstractVector.java