[GR-5543] Several fixes mainly concerning parallel mode.

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

...cle/truffle/r/ffi/impl/common/TracingUpCallsRFFIImpl.java

...rc/com/oracle/truffle/r/ffi/impl/nodes/FFIUpCallNode.java

...om/oracle/truffle/r/ffi/impl/nodes/FFIUpCallRootNode.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

...le/truffle/r/library/fastrGrid/graphics/R/fastrGraphics.R

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

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

com.oracle.truffle.r.native/fficall/src/jni/Rinternals.c

com.oracle.truffle.r.native/fficall/src/jni/Rmath.c

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

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

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

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

...om/oracle/truffle/r/nodes/builtin/snow/R/snow_overrides.R

...ntime/src/com/oracle/truffle/r/runtime/RInternalCode.java

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

...e/truffle/r/runtime/env/frame/FrameSlotChangeMonitor.java