Cherry pick @ahoppen's syntax arena changes to swift-5.0-branch. #19227
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This allows an elegant design in which we can still allocate RawSyntax nodes using a bump allocator but are able to automatically free that buffer once the last RawSyntax node within that buffer is freed. This also resolves a memory leak of RawSyntax nodes that was caused by ParserUnit not freeing its underlying ASTContext.
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@swift-ci please test |
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rdar://44109268