[EH] Fix for clang bug 24005 - no cleanup for array of memcpy-able objects in...

[EH] Fix for clang bug 24005 - no cleanup for array of memcpy-able objects in struct (patch by Denis Zobnin)

The fix is to emit cleanup for arrays of memcpy-able objects in struct if an exception is thrown later during copy-construction.
Differential Revision: http://reviews.llvm.org/D10989

llvm-svn: 241670