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-mfence-as-lock-add option in binutils 2.27

From: Parul Chahar
Subject: -mfence-as-lock-add option in binutils 2.27
Date: Tue, 3 Oct 2017 14:52:39 +0530
Hi,
I found that a new option "-mfence-as-lock-add" is added in binutils 2.27.
It generate lock instruction when "-mfence-as-lock-add=yes". Otherwise, mfence, lfence, sfence is generated.

Please let me know why this option is required. Why lock instruction is needed.

Thanks,
Parul 
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