The safer instrinsics-based pattern isn't GCC-compatible, because GCC added the intrisc some 8 years later than Clang did. Bug: 440670941 Change-Id: I3db3ef2393b21aae8427457a3c26b62993b75eaa Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/81607 Commit-Queue: David Benjamin <davidben@google.com> Reviewed-by: Adam Langley <agl@google.com> Auto-Submit: David Benjamin <davidben@google.com> Commit-Queue: Adam Langley <agl@google.com>