Update of 94055 to track the IR level call site information via an intrinsic.

Update of 94055 to track the IR level call site information via an intrinsic.
This allows code gen and the exception table writer to cooperate to make sure
landing pads are associated with the correct invoke locations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94726 91177308-0d34-0410-b5e6-96231b3b80d8