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Fix poisoning for very large structs
For very large structs poisoning could end up generating instructions requiring larger local var offsets than we can handle which would hit an IMPL_LIMIT that throws InvalidProgramException. Switch to using rep stosd (x86/x64)/memset helper (other platforms) when a local needs more than a certain number of mov instructions to poison. Also includes a register allocator change to mark killed registers as modified in addRefsForPhysRegMask instead of by the (usually) calling function, since this function is used directly in the change. Fix #60852
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