Revert -fno-var-tracking-assignments, doesn't exist on some compilers.
Revert -fno-var-tracking-assignments, doesn't exist on some compilers.

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