Extended implementation of as.vector to cover more cases.

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

...s/src/com/oracle/truffle/r/nodes/builtin/base/SApply.java

...m/oracle/truffle/r/nodes/builtin/base/UpdateDimNames.java

.../src/com/oracle/truffle/r/nodes/unary/CastDoubleNode.java

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

...le.r.test/src/com/oracle/truffle/r/test/all/AllTests.java

...t/src/com/oracle/truffle/r/test/failing/FailingTests.java

.../com/oracle/truffle/r/test/simple/TestSimpleBuiltins.java