The fix doesn't seem correct. Why would you want it to be a no-op for magical variables? Not even a warning!
Seems to me it should do a mg_get initially, upgrade the string, then a mg_set after the upgrading (taking care not to set SVf_POK).
It seems someone started to do it this way, given the presence of sv_utf8_upgrade_nomg. You might want to find the story behind that.
If you go down that route, the following fix is necessary in sv.h:
-#define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC)
+#define sv_utf8_upgrade(sv) sv_utf8_upgrade_flags(sv, SV_GMAGIC|SV_SM
If not, that line still needs fixing.
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