OSV-2020-1410 Use-of-uninitialized-value in float64_squash_input_denormal_aarch64eb

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=17032 Crash type: Use-of-uninitialized-value Crash state: float64squashinputdenormalaarch64eb float64tofloat32aarch64eb helpervfpfcvtsdaarch64eb...