As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
Taken from PR32845. Dan removed the most dominating leader check
in r303443, but we check this test anyway to make sure things
don't regress.
llvm-svn: 303515