AbsInt/CompCert v3.18 on GitHub

Code generation and optimization

Branch relaxation implemented for AArch64 and revised for PowerPC.
AArch64: shorten function preludes by using pre-indexed store-pair instructions (#583)

More prudent handling of static names for string literals (#579)
Enforce minimal safe alignment on global variables (#581)
x86 / Win64 ABI: fix inconsistency on callee-save XMM registers (#584)
Reject aligned attribute on bit fields in struct types.
Thread the current typing environment through Elab.elab_initializer.
Printing of assembly files: quote command-line arguments when needed (#586)
Printing of assembly files: revised string quoting in debugging information (#588)
x86 64 bits, Pjmptbl instruction: make sure the 32-bit argument is zero-extended to 64 bits before indexing in the jump table (#595)

Memory model: support target-dependent alignments for 64-bit chunks.
(Previously, default alignments were used for all targets, causing an incompatibility with the x86-32 ABI.)
Mem.loadv, Mem.storev: explicit check that all addressed bytes are at offsets <= Ptrofs.max_unsigned
(Previously, this was implicitly ensured by the alignment check, but the revised alignment handling makes an explicit check necessary.)
Stricter formal semantics for free, enforcing the requirement that the argument is a pointer obtained via malloc (#592)
Implement Iteration.WfIter without axioms, and make explicit the dependency of Iteration.GenIter on classical axioms.
Provide counted "for" loops in Iteration.CountedLoop and use them in ValueDomain.

Support Rocq 9.2.
If Rocq is installed, call the rocq command directly instead of going through the coq* compatibility wrappers (#587)
Updated the Rocq code to address most Rocq 9.2 warnings (#587)
Update to Flocq 4.2.2.
OCaml 5 is now officially supported.