*   Fixes an undefined behavior arising from null pointer dereference in TFLite
    MLIR optimizations
    ([CVE-2021-37689](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37689))
*   Fixes a FPE in LSH in TFLite
    ([CVE-2021-37691](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-37691))
*   Fixes a segfault on strings tensors with mismatched dimensions, arising in
    Go code

:= new(big.Int).SetBytes([]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7e}) nb.Lsh(nb, 128) expected := 129 for expected >= 0 { n := NewNat().setBig(nb) if n.TrailingZeroBitsVarT() != uint(expected) { t.Errorf("%d != %d", n.TrailingZeroBitsVarT(), expected) } nb.Rsh(nb, 1) expected-- } } func TestRightShift(t *testing.T) { nb, err := cryptorand.Int(cryptorand.Reader, new(big.Int).Lsh(big.NewInt(1), 1024)) if err != nil { t.Fatal(err) } for _, shift := range []uint{1, 32, 64, 128,...