Update vec_mergee operand specifiers (_vecb) (#52091)
Summary:
Patch needed in order to build on ppc64le with compiler g++V7. (w/o fix, only works on minimum compiler V8).
Fixes https://github.com/pytorch/pytorch/issues/51592
To be clear, credit where due:
I tested this patch on a ppc64 RHEL container using gcc/g++ 7.4 compiler to ensure a complete pytorch build was successful -- and it was. However, I do not take credit for this patch. I found and reported the issue, but the full brainpower to identify the cause of the error and the appropriate solution and thus the credit for this fix truly belongs to quickwritereader (and I am just helping with the legwork to integrate it after having tested it).
Pull Request resolved: https://github.com/pytorch/pytorch/pull/52091
Reviewed By: ejguan
Differential Revision: D26494943
Pulled By: glaringlee
fbshipit-source-id: 0babdb460db5047c54144f724466b77dd2d8a364
