Catch up to LLVM change.
Catch up to LLVM change.

Move from ErrorOr to Expected interface.

kgnk/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,kgnk/Halide,psuriana/Halide,kgnk/Halide,psuriana/Halide,ronen/Halide,ronen/Halide,ronen/Halide,ronen/Halide,ronen/Halide,psuriana/Halide,ronen/Halide,ronen/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide