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JIT: Prezero memory for RefPosition and Interval (version 2) #103709

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jakobbotsch
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Like #103707, but uses intrusive linked lists instead and manages the memory allocation directly as part of LinearScan.

Switch these to use intrusive linked lists and a prezeroed buffer.
@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Jun 19, 2024
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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@jakobbotsch
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TP improvements look like:
image
image

Still, it's a bit controversial due to #103707 (comment), and it's unclear whether the existing zeroing actually has any impact on performance.

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