Quick fix for the broken build on 2.1.x branch

After the v2.1.6 cherry-pick, the build is broken due to the wrong
std::optional API usage in the FCL OCL translation context. This patch
fixes the issue by updating the API usage to the correct one.

Author: vmustya

IGC/AdaptorOCL/ocl_igc_interface/impl/fcl_ocl_translation_ctx_impl.cpp

@@ -557,7 +557,7 @@ OclTranslationOutputBase* CIF_PIMPL(FclOclTranslationCtx)::TranslateCM(
 
     llvm::BumpPtrAllocator A;
     llvm::StringSaver Saver(A);
-    auto& FE = MaybeFE.getValue();
+    auto &FE = MaybeFE.value();
     bool isMemFile = false;
     auto FeArgs = processFeOptions(FE.LibInfo(), src, Out,
                                    options, Saver, platformStr,