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.
In relation to the approval and merge of the
[PRIF](https://github.com/llvm/llvm-project/pull/76088) specification
about multi-image features in Flang, here is a first PR to add support
for the `-fcoarray` compilation flag and the initialization of the PRIF
environment.
Other PRs will follow for adding support of lowering to PRIF.
