[GR-6085] [GR-5543] Many bug fixes to get PSU examples work.

...rc/com/oracle/truffle/r/engine/RRuntimeASTAccessImpl.java

...oracle/truffle/r/ffi/impl/common/JavaUpCallsRFFIImpl.java

...l/src/com/oracle/truffle/r/ffi/impl/nodes/MatchNodes.java

...pl/src/com/oracle/truffle/r/ffi/impl/nodes/MiscNodes.java

...m/oracle/truffle/r/ffi/impl/nodes/RandFunctionsNodes.java

...com/oracle/truffle/r/ffi/impl/upcalls/StdUpCallsRFFI.java

...library/src/com/oracle/truffle/r/library/stats/PPSum.java

....r.library/src/com/oracle/truffle/r/library/stats/model.R

...oracle.truffle.r.native/fficall/src/common/rffi_upcalls.h

...e.truffle.r.native/fficall/src/common/rffi_upcallsindex.h

...ve/fficall/src/truffle_common/Rinternals_truffle_common.h

...racle.truffle.r.native/fficall/src/truffle_common/Utils.c

...racle.truffle.r.native/fficall/src/truffle_common/match.c

...acle.truffle.r.native/fficall/src/truffle_common/unique.c

com.oracle.truffle.r.native/fficall/src/truffle_nfi/Memory.c

com.oracle.truffle.r.native/version.source

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Bind.java

...com/oracle/truffle/r/nodes/builtin/base/EnvFunctions.java

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

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