llvm: fix hand-rolled AT_EXECPATH search for older branches
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Authored by kevans on May 1 2020, 2:46 AM.

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Summary

Once we hit AT_NULL, we need to bail out of the loop; not just the enclosing switch. This fixes clang when AT_EXECPATH isn't present on older branches (e.g. under qemu-user-static, at the moment), where we would previously run off the end of ::environ.

Reported by: Andrew Gierth
MFC after: 3 days