Purpose of _gcry_burn_stack

[Michael Gorven]

Hi

I am using parts of libgcrypt in my implementation of LUKS support in GRUB2. 
Most of the ciphers have a number of calls to _gcry_burn_stack, but I can't 
figure out what exactly this does. It doesn't affect the operation of the 
ciphers (I currently have it commented out). What is the purpose of this 
function, and can I leave it out?

Thanks
Michael

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