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Auto merge of #147002 - notriddle:stringdex3, r=GuillaumeGomez
rustdoc-search: stringdex update with more packing
Before:
18M build/x86_64-unknown-linux-gnu/doc/search.index/
57M build/x86_64-unknown-linux-gnu/compiler-doc/search.index/
After:
16M build/x86_64-unknown-linux-gnu/doc/search.index/
49M build/x86_64-unknown-linux-gnu/compiler-doc/search.index/
CC rust-lang/rust#146063
