Rollup of 11 pull requests

[jhpratt]

Successful merges:

• Fix long lines which rustfmt fails to format #136606 (Fix long lines which rustfmt fails to format)
• Stabilize NonZero::count_ones #136663 (Stabilize NonZero::count_ones)
• library: doc: core::alloc::Allocator: trivial typo fix #136672 (library: doc: core::alloc::Allocator: trivial typo fix)
• Improve examples for file locking #136704 (Improve examples for file locking)
• cg_llvm: Reduce visibility of some items outside the llvm module #136721 (cg_llvm: Reduce visibility of some items outside the llvm module)
• rustc_target: Add the fp16 target feature for AArch32 #136813 (rustc_target: Add the fp16 target feature for AArch32)
• fix i686-unknown-hurd-gnu x87 footnote #136830 (fix i686-unknown-hurd-gnu x87 footnote)
• Fix platform support table for i686-unknown-uefi #136832 (Fix platform support table for i686-unknown-uefi)
• Stop using span hack for contracts feature gating #136835 (Stop using span hack for contracts feature gating)
• Overhaul how contracts are lowered on fn-like bodies #136837 (Overhaul how contracts are lowered on fn-like bodies)
• fix ensure_monomorphic_enough #136839 (fix ensure_monomorphic_enough)

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