[Sema] Mark array element destructors referenced during initialization

[Sema] Mark array element destructors referenced during initialization

This fixes a crash where we would neglect to mark a destructor referenced for an
__attribute__((no_destory)) array. The destructor is needed though, since if an
exception is thrown we need to cleanup the elements.

rdar://48462498

Differential revision: https://reviews.llvm.org/D61165

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@360446 91177308-0d34-0410-b5e6-96231b3b80d8