Rollup of 18 pull requests
Successful merges:
- #49423 (Extend tests for RFC1598 (GAT))
- #50010 (Give SliceIndex impls a test suite of girth befitting the implementation (and fix a UTF8 boundary check))
- #50447 (Fix update-references for tests within subdirectories.)
- #50514 (Pull in a wasm fix from LLVM upstream)
- #50524 (Make DepGraph::previous_work_products immutable)
- #50532 (Don't use Lock for heavily accessed CrateMetadata::cnum_map.)
- #50538 ( Make CrateNum allocation more thread-safe. )
- #50564 (Inline `Span` methods.)
- #50565 (Use SmallVec for DepNodeIndex within dep_graph.)
- #50569 (Allow for specifying a linker plugin for cross-language LTO)
- #50572 (Clarify in the docs that `mul_add` is not always faster.)
- #50574 (add fn `into_inner(self) -> (Idx, Idx)` to RangeInclusive (#49022))
- #50575 (std: Avoid `ptr::copy` if unnecessary in `vec::Drain`)
- #50588 (Move "See also" disambiguation links for primitive types to top)
- #50590 (Fix tuple struct field spans)
- #50591 (Restore RawVec::reserve* documentation)
- #50598 (Remove unnecessary mutable borrow and resizing in DepGraph::serialize)
- #50606 (Retry when downloading the Docker cache.)
Failed merges:
- #50161 (added missing implementation hint)
- #50558 (Remove all reference to DepGraph::work_products)
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