[flang-commits] [flang] [Flang] Add parser support for prefetch directive (PR #139702)

[Tom Eccles via flang-commits]

https://github.com/tblah approved this pull request.

LGTM. Please could you add a `TODO(loc, "!$dir prefetch")` in lowering so that this does not get silently ignored until the codegen lands.

https://github.com/llvm/llvm-project/pull/139702