Rollup of 16 pull requests

[Zalathar]

Successful merges:

• core: add Peekable::next_if_map #143725 (core: add Peekable::next_if_map)
• Stabilize path_add_extension #145209 (Stabilize path_add_extension)
• fix drop scope for super let bindings within if let #145342 (fix drop scope for super let bindings within if let)
• raw_vec.rs: Remove superfluous fn alloc_guard #145750 (raw_vec.rs: Remove superfluous fn alloc_guard)
• Ensure we emit an allocator shim when only some crate types need one #145962 (Ensure we emit an allocator shim when only some crate types need one)
• Add LSX accelerated implementation for source file analysis #145963 (Add LSX accelerated implementation for source file analysis)
• add #[must_use] to array::repeat #146054 (add #[must_use] to array::repeat)
• Derive PartialEq for InvisibleOrigin #146090 (Derive PartialEq for InvisibleOrigin)
• Correct typo in rustc_errors comment #146120 (Correct typo in rustc_errors comment)
• Rename ToolRustc to ToolRustcPrivate #146127 (Rename ToolRustc to ToolRustcPrivate)
• Revert "Make lto and linker-plugin-lto work the same for compiler_builtins #146133 (Revert "Make lto and linker-plugin-lto work the same for compiler_builtins)
• llvm: nvptx: Layout update to match LLVM #146134 (llvm: nvptx: Layout update to match LLVM)
• docs(std): add missing closing code block fences in doc comments #146136 (docs(std): add missing closing code block fences in doc comments)
• Disallow frontmatter in --cfg and --check-cfg arguments #146137 (Disallow frontmatter in --cfg and --check-cfg arguments)
• compiletest: cygwin follows windows in using PATH for dynamic libraries #146140 (compiletest: cygwin follows windows in using PATH for dynamic libraries)
• miri subtree update #146156 (miri subtree update)

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