As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
x86-64 is an invalid architecture in triples. Changing it to the correct
triple (x86_64) changes some tests, because SLP is not deemed profitable
any more.
Reviewers: ABataev, RKSimon, spatel
Reviewed By: RKSimon
Differential Revision: https://reviews.llvm.org/D58931
llvm-svn: 355420