Add error report when Module::GetObjectFile() fails to find a plugin to open an object file.

Change by Stephane Sezer.

llvm-svn: 217251
diff --git a/lldb/source/Core/Module.cpp b/lldb/source/Core/Module.cpp
index 6f16ada..4e985c0 100644
--- a/lldb/source/Core/Module.cpp
+++ b/lldb/source/Core/Module.cpp
@@ -1309,6 +1309,10 @@
                 // unknown.
                 m_objfile_sp->GetArchitecture (m_arch);
             }
+            else
+            {
+                ReportError ("failed to load objfile for %s", GetFileSpec().GetPath().c_str());
+            }
         }
     }
     return m_objfile_sp.get();