[GR-6923] Adopting LLVM into FastR.

ci.hocon

.../com/oracle/truffle/r/engine/interop/ActiveBindingMR.java

...ngine/src/com/oracle/truffle/r/engine/interop/ListMR.java

...ruffle/r/engine/interop/RAbstractVectorAccessFactory.java

...racle/truffle/r/engine/interop/RArgsValuesAndNamesMR.java

...rc/com/oracle/truffle/r/engine/interop/RConnectionMR.java

...ine/src/com/oracle/truffle/r/engine/interop/REmptyMR.java

...c/com/oracle/truffle/r/engine/interop/REnvironmentMR.java

...c/com/oracle/truffle/r/engine/interop/RExternalPtrMR.java

.../src/com/oracle/truffle/r/engine/interop/RFunctionMR.java

.../src/com/oracle/truffle/r/engine/interop/RLanguageMR.java

...e/src/com/oracle/truffle/r/engine/interop/RMissingMR.java

...gine/src/com/oracle/truffle/r/engine/interop/RNullMR.java

...e/src/com/oracle/truffle/r/engine/interop/RPromiseMR.java

.../src/com/oracle/truffle/r/engine/interop/RS4ObjectMR.java

...ne/src/com/oracle/truffle/r/engine/interop/RSymbolMR.java

.../com/oracle/truffle/r/engine/interop/RUnboundValueMR.java

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

...m/oracle/truffle/r/ffi/impl/interop/CharSXPWrapperMR.java

.../src/com/oracle/truffle/r/ffi/impl/interop/DLLInfoMR.java