RegisterCoalescer: Fix assert on remat to copy-to-physreg with subregs (#121734) Do not try to rematerialize a super-register def used by a subregister extract copy into a copy to a physical register if the other pieces of the full physreg are live at the rematerialization point. It would insert the super-register def at the rematerialization point, and assert since the other half of the register was already live. This is analagous to the undef subregister def handling above, which handled the virtual register case. Fixes #120970
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