Fix signed semantics for one-operand IMUL - #2400
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Summary
imulas a signed double-width product in both the symbolic and concrete x86 semanticsmuland the low-word behavior of the otherimulformsmulhigh wordTesting
opam exec -- make -f Makefile.coq src/Assembly/WithBedrock/SemanticsTests.vo -j2opam exec -- make -f Makefile.coq src/Assembly/WithBedrock/SymbolicProofs.vo -j2git diff --checkAddresses Scrutineer finding #2514.