simplify lambda function use in conv dnnlowp ops to fix #15911 (#15996)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15996
As reported in issue #15911, gcc 4.9 was getting internal compiler error due to a complex use of lambda function in conv_dnnlowp_op.cc and conv_acc16_op.cc . This diff simplifies them.
Reviewed By: viswanathgs
Differential Revision: D13648264
fbshipit-source-id: 1551ae8a0a7653749185dca51ccceb2471b96b82
