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Fix a regression in r321608.

Description

Fix a regression in r321608.

On i386 with CPUID but without SSE2, set lfence_works to LMB_NONE
instead of looping.

Reported and tested by: Andre Albsmeier <andre@fbsd.e4m.org>
Sponsored by: The FreeBSD Foundation
MFC after: 3 days

Details

Provenance
kibAuthored on
Parents
rS322455: sh: Add test for sh -c with missing command string.
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