Rollup of 6 pull requests

[Zalathar]

Successful merges:

• Improve is_ascii performance on x86_64 with explicit SSE2 intrinsics #151611 (Improve is_ascii performance on x86_64 with explicit SSE2 intrinsics)
• Add missing mut to pin.rs docs #150705 (Add missing mut to pin.rs docs)
• compiletest: add implied needs-target-std for codegen mode tests unless annotated with #![no_std]/#![no_core] #151294 (compiletest: add implied needs-target-std for codegen mode tests unless annotated with #![no_std]/#![no_core])
• Add a documentation remapping path scope for rustdoc usage #151589 (Add a documentation remapping path scope for rustdoc usage)
• Fix broken WASIp1 reference link #151639 (Fix broken WASIp1 reference link)
• Update sysinfo version to 0.38.0 #151645 (Update sysinfo version to 0.38.0)

r? @ghost

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