Rollup of 18 pull requests

[Dylan-DPC-zz]

Successful merges:

• Fix cross compiling dist/build invocations #76799 (Fix cross compiling dist/build invocations)
• Don't generate bootstrap usage unless it's needed #76800 (Don't generate bootstrap usage unless it's needed)
• Update LLVM #76806 (Update LLVM)
• Use const-checking to forbid use of unstable features in const-stable functions #76807 (Use const-checking to forbid use of unstable features in const-stable functions)
• use strip_prefix over starts_with and manual slicing based on pattern length (clippy::manual_strip) #76828 (use strip_prefix over starts_with and manual slicing based on pattern length (clippy::manual_strip))
• Let backends define custom targets #76832 (Let backends define custom targets)
• Move to intra doc links in core/src/future #76840 (Move to intra doc links in core/src/future)
• Use intra docs links in core::{ascii, option, str, pattern, hash::map} #76845 (Use intra docs links in core::{ascii, option, str, pattern, hash::map})
• Avoiding unnecesary allocations at rustc_errors #76846 (Avoiding unnecesary allocations at rustc_errors)
• update Miri #76848 (update Miri)
• Use intra-doc links in library/core/src/task/wake.rs #76853 (Use intra-doc links in library/core/src/task/wake.rs)
• Don't download/sync llvm-project submodule if download-ci-llvm is set #76864 (Don't download/sync llvm-project submodule if download-ci-llvm is set)
• support panic=abort in Miri #76871 (support panic=abort in Miri)
• Remove DeclareMethods #76872 (Remove DeclareMethods)
• Move to intra-doc links in library/alloc/src/collections/binary_heap.rs #76875 (Move to intra-doc links in library/alloc/src/collections/binary_heap.rs)
• Move the version number to a plaintext file #76878 (Move the version number to a plaintext file)
• Add allocation information to undefined behaviour errors. #76881 (Add allocation information to undefined behaviour errors.)
• Record tcx.def_span instead of item.span in crate metadata #76898 (Record tcx.def_span instead of item.span in crate metadata)

Failed merges:

r? @ghost