Don't pass in oat file name to NativeLocationInImage

We already have the oat file name stored in the relocation, using
the one passed in for the image info can cause a mismatch.

I suspect this fixes a bug repated to copied methods where there
was a oat file name mismatch. When we assign the native object
relocation for the methods of a class, we use the dex cache from
that class.

However, we use method's declaring class in NativeLocationVisitor
by using ArtMethod::GetDexCache. This could result in using the
wrong ImageInfo if the declaring class is in another image.

Change-Id: I753207f7b773fac182f84ba57c640c09f9ce911f