[modules] When emitting an update record containing the body of a destructor,

[modules] When emitting an update record containing the body of a destructor,
also emit the updated 'operator delete' looked up for that destructor. Switch
from UpdateDecl to an actual update record when this happens due to implicitly
defining a special member function and unify this code path and the one for
instantiating a function definition.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@215132 91177308-0d34-0410-b5e6-96231b3b80d8