[flang] Add support of THIS_IMAGE and NUM_IMAGES with PRIF#154081

JDPailleux merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

SiPearl:jdp/flang/prif_this_image_num_imagesSiPearl/llvm-project:jdp/flang/prif_this_image_num_imagesCopy head branch name to clipboard