I realize that PIG is working on Fortran + LLVM, but even as the
government and other people love to waste money - If you're interested
in this technology *today*, please message me off list.
Unfortunately I can't donate the code under a license which is llvm
community friendly, but interested parties could get source access.
It's rock solid stable *and* even includes a bunch of loop optimizer
stuff which you need for real HPC codes.