Fix bug with inner loops
Fix bug with inner loops

The find steady state mutator always changes the innards by removing
likely tags, but this doesn't mean a simplification occurred. Check
min_steady_val or max_steady_val instead.


Former-commit-id: 4264cce7c82aa093a2e9a668acc2c8a2ab1b82b1
darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide