[Bug target/101891] Adjust -fzero-call-used-regs to always use XOR

[qinzhao at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101891

qinzhao at gcc dot gnu.org changed:

           What    |Removed                     |Added
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   Target Milestone|---                         |13.0