asm_avr.inc: fix compilation on GCC 15.2.0 #237
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Compilation with GCC 15.2.0 failed with:
This works around the issue by manually placing right into the Y register before the inline assembly.
The generated assembly from the function is almost perfectly identical. Here is a side-by-side comparison. Basically the old code prepared first the Z register, then the Y register, the new code swaps the order. Otherwise the generated code is identical.