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Krzysztof Parzyszek
2f4ea347c9
[RegisterCoalescer] Extend a subrange if needed when filling range gap
Register live ranges may have had gaps that after coalescing should be removed. This is done by adding a new segment to the range, and merging it with neighboring segments. When doing so, do not assume that each subrange of the register ended at the same index. If a subrange ended earlier, adding this segment could make the live range invalid. Instead, if the subrange is not live at the start of the segment, extend it first.
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