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[sanitizer] remove FreeBSD PS_STRINGS fallback
The PS_STRINGS constant can easily be incorrect with mismatched kernel/userland - e.g. when building i386 sanitizers on FreeBSD/amd64 with -m32. The kern.ps_strings sysctl was introduced over 20 years ago as the supported way to fetch the environment and argument string addresses from the kernel, so the fallback is never used. Differential Revision: http://reviews.llvm.org/D19027 llvm-svn: 266305
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