[Bug rtl-optimization/88253] Inlining of function incorrectly deletes volatile register access when using XOR in avr-gcc

[westfw at westfw dot info]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88253

--- Comment #2 from William Westfield <westfw at westfw dot info> ---
I did say that it still happens with 8.1...
However, the 5.4.0 version is the latest version supported by the vendor.