[flang][OpenMP][NFC] test the current private dealloc runtime calls

It looks like in most cases we still don't make calls to deallocate
allocatable members of derived types which have been privatized.

This is just intended to add a test for the one case where we do, to
make sure this doesn't regress with my upcoming changes.

Author: tblah

flang/test/Lower/OpenMP/derived-type-allocatable.f90

@@ -24,6 +24,9 @@ module m1
 !CHECK-LABEL: omp.private {type = private} @_QMm1Ftest_array_of_allocs
 !CHECK:       fir.call @_FortranAInitializeClone
 !CHECK-NEXT:  omp.yield
+!CHECK:       } dealloc {
+!CHECK:       fir.call @_FortranAAllocatableDeallocate
+!CHECK:       omp.yield
 
 !CHECK-LABEL: omp.private {type = firstprivate} @_QMm1Ftest_array
 !CHECK-NOT:   fir.call @_FortranAInitializeClone