Don't generate any code for an explicit call to a trivial destructor.

Don't generate any code for an explicit call to a trivial destructor.

Now that parsing, semantic analysis, and (I think) code generation of
pseudo-destructor expressions and explicit destructor calls works,
update the example-dynarray.cpp test to destroy the objects it
allocates and update the test to actually compile + link.
The code seems correct, but the Clang-compiled version dies with a
malloc error. Time to debug!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@81025 91177308-0d34-0410-b5e6-96231b3b80d8