RFR: 8278525: Additional -Wnonnull errors happen with GCC 11

[Dean Long]

On Thu, 9 Dec 2021 23:48:42 GMT, Dan Lutker <duke at openjdk.java.net> wrote:

> 8271515 introduced more issues with xmm0

Marked as reviewed by dlong (Reviewer).

-------------

PR: https://git.openjdk.java.net/jdk/pull/6788