[flang] [llvm] [flang][OpenMP] Decompose compound constructs, do recursive lowering (PR #90098)

[Omair Javaid via llvm-commits]

omjavaid wrote:

This appears to cause a regression in LLVM testsuite gfortran testsuire  FAIL: test-suite::gfortran-regression-compile-regression__gomp__reduction7_f90.test
https://lab.llvm.org/buildbot/#/builders/197/builds/14288


https://github.com/llvm/llvm-project/pull/90098