Auto merge of #144393 - heiher:str-contains-lsx, r=tgross35

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LoongArch64 LSX fast-path for `str.contains(&str)`

Benchmark results with LLVM 21 on LA664:

```
OLD:
test bench_is_contained_in ... bench:          43.63 ns/iter (+/- 0.04)

NEW:
test bench_is_contained_in ... bench:          12.81 ns/iter (+/- 0.01)
```

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bors 2025-07-29 20:44:32 +00:00

parent 68b4b6b50a 32b73fc7ae

commit 89581ae706

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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