[GR-2798] [GR-5643] Fixing testthat.

...gen/src/com/oracle/truffle/r/ffi/codegen/CodeGenBase.java

...src/com/oracle/truffle/r/ffi/codegen/FFITestsCodeGen.java

.../oracle/truffle/r/ffi/codegen/FFIUpCallsIndexCodeGen.java

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

...racle/truffle/r/ffi/impl/nodes/AttributesAccessNodes.java

.../com/oracle/truffle/r/ffi/impl/nodes/ListAccessNodes.java

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

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

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

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

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

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

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

.../com/oracle/truffle/r/runtime/data/RAttributesLayout.java

....truffle.r.test.native/packages/testrffi/testrffi/R/api.R

...fle.r.test.native/packages/testrffi/testrffi/R/testrffi.R

...uffle.r.test.native/packages/testrffi/testrffi/src/init.c

...e.r.test.native/packages/testrffi/testrffi/src/init_api.h

...test.native/packages/testrffi/testrffi/src/rffiwrappers.c

...test.native/packages/testrffi/testrffi/src/rffiwrappers.h