As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
Reuse the handling for llvm.used, and don't transform such globals.
Fixes a failure on the asan buildbot caused by my previous commit.
llvm-svn: 337973