[llvm-project] Introduce paged vector [v6.30] #14411
Merged
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The goal of the class is to be an (almost) drop in replacement for SmallVector and std::vector when those are presized and filled later, as it happens in SourceManager and ASTReader.
By doing so, sparsely accessed PagedVector can profit from reduced memory footprint.
Co-authored-by: Jonas Hahnfeld [email protected]
(cherry picked from commit 9c7bac0, backport of #13808)