[clang] [Clang][OpenMP][LoopTransformations] Fix incorrect number of generated loops for Tile and Reverse directives (PR #140532)

[Walter J.T.V via cfe-commits]

eZWALT wrote:

> Are there any tests that might be affected by this change?

Yesterday I ran all the tests (check-clang-openmp and check-clang) and no change in the behaviour or incidence was found, although i'll re-execute them just as a sanity check. Just a remainder but this merge request should be merged firstly before #139293. 

https://github.com/llvm/llvm-project/pull/140532