Bump smallvec from 1.1.0 to 1.9.0 in /experimental/rs

[dependabot[bot]]

Bumps smallvec from 1.1.0 to 1.9.0.

Release notes

Sourced from smallvec's releases.

v1.9.0

• Add retain_mut as an alias for retain, for compatibility with std::vec::Vec (#283).

v1.8.1

• Optimize inserts at the end of the vector (#282).
• Fix possible aliasing issues with raw pointers (#277).
• Fix format of license field in Cargo manifest (#278).

v1.8.0

• Add optional support for the arbitrary crate (#275).

v1.7.0

• new_const and from_const constructors for creating a SmallVec in const contexts. Requires Rust 1.51 and the optional const_new feature. (#265)

v1.6.1

• Fix a possible buffer overflow in insert_many (#252, #254).

v1.6.0

• The "union" feature is now compatible with stable Rust 1.49 (#248, #247).
• Fixed warnings when compiling with Rust 1.51 nightly (#242, #246).

v1.5.1

• Improve performance of push (#241).

v1.5.0

• Add the append method (#237).
• Add support for more array sizes between 17 and 31 (#234).
• Don't panic on deserialization errors (#238).

v1.4.2

• insert_many no longer leaks elements if the provided iterator panics (#213).
• The unstable const_generics and specialization features are updated to work with the most recent nightly Rust toolchain (#232).
• Internal code cleanup (#229, #231).

v1.4.1

• Don't allocate when the size of the element type is zero. Allocating zero bytes is undefined behavior. (#228)

v1.4.0

• Add try_reserve, try_reserve_exact, and try_grow methods (#214).

v1.3.0

• Add a new unstable const_generics feature (#204).
• Improve inlining of constructor functions (#206).
• Add a slice.to_smallvec() convenience method (#203).
• Documentation and testing improvements.

v1.2.0

• IntoIter now implements Debug (#196).
• smallvec! macro is now easier to use in no_std contexts where the vec! macro isn't automatically imported (#198).

Commits

• 7fa951f Version 1.9.0
• e9c2f0a Add retain_mut method (as an alias to retain)
• 4ce5e16 Version 1.8.1
• 7f9e513 Add a benchmark for the insert case where index == len.
• b233568 Optimize insert for the case where index == len.
• bb8def4 Use SPDX license format (#278)
• 8363ea8 Auto merge of #277 - saethlin:fix-aliasing, r=mbrubeck
• ecd69b9
• b257aad Fix Miri complaints with -Zmiri-tag-raw-pointers
• 0a4fdff Version 1.8.0
• Additional commits viewable in compare view

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