bpf: Fix accesses to uninit stack slots

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                        "kernel/bpf/verifier.c",
                        "tools/testing/selftests/bpf/progs/iters.c",
                        "tools/testing/selftests/bpf/progs/test_global_func16.c",
                        "tools/testing/selftests/bpf/progs/verifier_basic_stack.c",
                        "tools/testing/selftests/bpf/progs/verifier_int_ptr.c",
                        "tools/testing/selftests/bpf/progs/verifier_raw_stack.c",
                        "tools/testing/selftests/bpf/progs/verifier_var_off.c",
                        "tools/testing/selftests/bpf/verifier/atomic_cmpxchg.c",
                        "tools/testing/selftests/bpf/verifier/calls.c"
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