[lld-macho] Fix left shift of negative value UB
I introduced this mistake in 573c7e6b. Fixes the failure on this UBSan bot: https://lab.llvm.org/buildbot/#/builders/5/builds/25537
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I introduced this mistake in 573c7e6b. Fixes the failure on this UBSan bot: https://lab.llvm.org/buildbot/#/builders/5/builds/25537