Revert r330474 - "[HWASan] Introduce non-zero based and dynamic shadow memory (compiler-rt)."

This commit causes internal errors with ld.bfd 2.24. My guess is that
the ifunc usage in this commit is causing problems. This is the default
system linker on Trusty Tahr, which is from 2014. I claim it's still in
our support window. Maybe we will decide to drop support for it, but
let's get the bots green while we do the investigation and have that
discussion.

Discovered here: https://crbug.com/835864

llvm-svn: 330619