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In LoadLinkPartnerEventObjectSpritePalette, using paletteNum += 6 causes
GCC to "mark" paletteNum's register as a possible overflow, even though
it performs the overflow check. Then, when passing args to LoadPalette,
GCC fails to recognize that 0x100 + ((any u8) << 4) can never overflow
as a u16. It then does an overflow check before calling LoadPalette.
Assigning to a temp variable seems to avoid this "marking" behavior.
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