Revert "[Serialization] Remove delta encoding optimization (#145670)" #11622
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…)" This reverts commit e90ab0e. Conflicts: clang/lib/Serialization/ASTWriter.cpp
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This reverts commit e90ab0e. Removing the delta encoding optimization led to a 5% in PCH sizes and builders ran out of disk space.
Conflicts:
clang/lib/Serialization/ASTWriter.cpp
Temporary workaround for rdar://161186237.