[ORC] Fix a missing move in ce2207a.

This should fix the build failure at
http://lab.llvm.org:8011/builders/clang-cmake-x86_64-sde-avx512-linux/builds/32524
and others.

Author: lhames

llvm/lib/ExecutionEngine/Orc/CompileUtils.cpp

@@ -37,7 +37,7 @@ irManglingOptionsFromTargetOptions(const TargetOptions &Opts) {
 Expected<SimpleCompiler::CompileResult> SimpleCompiler::operator()(Module &M) {
   CompileResult CachedObject = tryToLoadFromObjectCache(M);
   if (CachedObject)
-    return CachedObject;
+    return std::move(CachedObject);
 
   SmallVector<char, 0> ObjBufferSV;