[flang][runtime] Fix empty FINDLOC() results #75251
Merged
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When FINDLOC() can't find its target value among the unmasked array elements, it must return a zero result. Its implementation doesn't sufficiently distinguish a zero result from a hit in an array with lower bound(s) less than one. Fix by adding a flag to distinguish the case with no hits from cases with hits.
Fixes llvm-test-suite/Fortran/gfortran/regression/findloc_6.f90.