Fix build with gcc 7.5 by adding a "redundant move"

The constructor of Expected<T> expects as T&&, but gcc-7.5 does not
infer an rvalue in this context apparently.

llvm/examples/OrcV2Examples/LLJITWithLazyReexports/LLJITWithLazyReexports.cpp

@@ -107,7 +107,7 @@ int main(int argc, char *argv[]) {
       [](ThreadSafeModule TSM,
          const MaterializationResponsibility &R) -> Expected<ThreadSafeModule> {
         TSM.withModuleDo([](Module &M) { dbgs() << "---Compiling---\n" << M; });
-        return TSM;
+        return std::move(TSM); // Not a redundant move: fix build on gcc-7.5
       });
 
   // (3) Create stubs and call-through managers:

llvm/examples/ThinLtoJIT/ThinLtoJIT.cpp

@@ -191,7 +191,7 @@ Expected<ThreadSafeModule> ThinLtoJIT::setupMainModule(StringRef MainFunction) {
   }
 
   if (auto TSM = GlobalIndex->parseModuleFromFile(*M))
-    return TSM;
+    return std::move(TSM); // Not a redundant move: fix build on gcc-7.5
 
   return createStringError(inconvertibleErrorCode(),
                            "Failed to parse main module");