ofz-8516: Undefined-shift in StreamBitReader::readBits

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=8516
6 jobs for ofz-8516 in 4 minutes and 44 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #90474
build

00:04:44

passed #90479
build_android

00:00:43

passed #90475
build_clang_libcpp

00:04:38

passed #90478
build_clazy

00:04:23

passed #90476
build_gcc_49

00:03:49

passed #90477
build_mingw64_fedora

00:04:07