Implement the indirect counter increment code in a better way. Instead of

Implement the indirect counter increment code in a better way. Instead of
replicating the code for every place it's needed, we instead generate a function
that does that for us. This function is local to the executable, so there
shouldn't be any writing violations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157564 91177308-0d34-0410-b5e6-96231b3b80d8