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Reduce some allocations from remote classification serialization #75911

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ToddGrun
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SerializableClassifiedSpans.Dehydrate was previously taking in an ImmutableArray, causing several callers to allocate. Instead, it can take in a SegmentedList, which several of the callers already have, and if not, a pooled instance can be obtained and populated.

ClassifiedSpan[] shows up as 5.4% of allocations in our CodeAnalysis process in the platform's scrolling speedometer test.

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SerializableClassifiedSpans.Dehydrate was previously taking in an ImmutableArray, causing several callers to allocate. Instead, have it take in a SegmentedList, which several of the callers already have, and if not, a pooled instance can be obtained and populated.

ClassifiedSpan[] shows up as 5.4% of allocations in our CodeAnalysis process in the platform's scrolling speedometer test.
@ToddGrun ToddGrun requested a review from a team as a code owner November 14, 2024 03:21
@dotnet-issue-labeler dotnet-issue-labeler bot added Area-IDE untriaged Issues and PRs which have not yet been triaged by a lead labels Nov 14, 2024
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