bors 0547c41f90 Auto merge of #116672 - maurer:128-align, r=nikic
LLVM 18 x86 data layout update

With https://reviews.llvm.org/D86310 LLVM now has i128 aligned to 16-bytes on x86 based platforms. This will be in LLVM-18. This patch updates all our spec targets to be 16-byte aligned, and removes the alignment when speaking to older LLVM.

This results in Rust overaligning things relative to LLVM on older LLVMs.

This implements MCP https://github.com/rust-lang/compiler-team/issues/683.

See #54341
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