Wei Wang e6b8320c0a [clang][AST] Improve AST Reader/Writer memory footprint ...

Reduce memory footprint of AST Reader/Writer:
1. Adjust internal data containers' element type.
2. Switch to set for deduplication of deferred diags.

Differential Revision: https://reviews.llvm.org/D101793

2021-05-20 15:34:29 -07:00

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