FastR Grid: add TruffleBoundary annotations

...com/oracle/truffle/r/library/fastrGrid/DoSetViewPort.java

...com/oracle/truffle/r/library/fastrGrid/GridLinesNode.java

.../com/oracle/truffle/r/library/fastrGrid/GridTextNode.java

...y/src/com/oracle/truffle/r/library/fastrGrid/LCircle.java

.../src/com/oracle/truffle/r/library/fastrGrid/LConvert.java

...rc/com/oracle/truffle/r/library/fastrGrid/LGridDirty.java

...src/com/oracle/truffle/r/library/fastrGrid/LInitGPar.java

...src/com/oracle/truffle/r/library/fastrGrid/LInitGrid.java

...racle/truffle/r/library/fastrGrid/LInitViewPortStack.java

.../src/com/oracle/truffle/r/library/fastrGrid/LNewPage.java

...y/src/com/oracle/truffle/r/library/fastrGrid/LPoints.java

...ary/src/com/oracle/truffle/r/library/fastrGrid/LRect.java

...src/com/oracle/truffle/r/library/fastrGrid/LSegments.java

...om/oracle/truffle/r/library/fastrGrid/LUnsetViewPort.java

...fle/r/library/fastrGrid/grDevices/InitWindowedDevice.java