[GMR/OperandBundles] Teach getModRefBehavior about operand bundles

In general, memory restrictions on a called function (e.g. readnone)
cannot be transferred to a CallSite that has operand bundles.  It is
possible to make this inference smarter, but lets fix the behavior to be
correct first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260193 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed