e4334afca0
In relation to the approval and merge of the https://github.com/llvm/llvm-project/pull/76088 specification about multi-image features in Flang. Here is a PR on adding support for `THIS_IMAGE` and `NUM_IMAGES` in conformance with the PRIF specification. For `THIS_IMAGE`, the lowering to the subroutine containing the coarray argument is not present in this PR, and will be in a future one.