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Commit 9385aaa84851 ("[sancov] Fix PR33732") added zeroext to
__sanitizer_cov_trace(_const)?_cmp[1248] parameters for x86_64 only,
however, it is useful on other targets, in particular, on SystemZ: it
fixes swap-cmp.test.
Therefore, use it on all targets. This is safe: if target ABI does not
require zero extension for a particular parameter, zeroext is simply
ignored. A similar change has been implemeted as part of commit
3bc439bdff8b ("[MSan] Add instrumentation for SystemZ"), and there were
no problems with it.
Reviewed By: morehouse
Differential Revision: https://reviews.llvm.org/D85689
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