7db4e6c1ec
Fixes a crash uncovered by [pr77666.f90](https://github.com/llvm/llvm-test-suite/blob/main/Fortran/gfortran/regression/gomp/pr77666.f90) in the test suite when delayed privatization is enabled by default. In particular, whenever `PrivCB` (the callback responsible for generating privatizaiton logic for an OMP variable) generates a multi-block privatization region, the insertion point diverges: the BB component of the IP can become a different BB from the parent block of the instruction iterator component of the IP. This PR updates the IP to make sure that the BB is the parent block of the instruction iterator.