Retrieve the dyld shared cache mapping offset from the shared cache instead of hardcoding the value.
Read the version number of the dyld shared cache.
<rdar://problem/13311882> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176589 91177308-0d34-0410-b5e6-96231b3b80d8