FFI: infrastructure for exception handling support in up-calls & NFI implementation

...ruffle/r/ffi/impl/llvm/HandleLLVMUpCallExceptionNode.java

.../com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Call.java

...racle/truffle/r/ffi/impl/managed/Managed_RFFIFactory.java

.../truffle/r/ffi/impl/nfi/HandleNFIUpCallExceptionNode.java

...mpl/src/com/oracle/truffle/r/ffi/impl/nfi/NFIContext.java

...src/com/oracle/truffle/r/ffi/impl/nfi/NativeFunction.java

...rc/com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_Call.java

.../src/com/oracle/truffle/r/ffi/processor/FFIProcessor.java

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

...acle.truffle.r.native/fficall/src/truffle_nfi/rffiutils.c

...acle.truffle.r.native/fficall/src/truffle_nfi/rffiutils.h

...untime/src/com/oracle/truffle/r/runtime/ffi/CallRFFI.java