reduce logging for layernorm (#41305)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41305
added a warning message when layernorm under/overflows, which is what
nnpi does, reducing the frequency of the logging to every 1000
Test Plan: compilation
Reviewed By: yinghai
Differential Revision: D22492726
fbshipit-source-id: 9343beeae6e65bf3846c6b3d2edd2a08dac85ed6
