Propogate the error message, not just the error state.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128094 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp

@@ -334,4 +334,9 @@ sys::MemoryBlock RuntimeDyld::getMemoryBlock() {
   return Dyld->getMemoryBlock();
 }
 
+StringRef RuntimeDyld::getErrorString()
+{
+  return Dyld->getErrorString();
+}
+
 } // end namespace llvm