Revert "Generating assumption loads of vptr after ctor call (fixed)"

It seems that there is small bug, and we can't generate assume loads
when some virtual functions have internal visibiliy
This reverts commit 982bb7d9.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@247332 91177308-0d34-0410-b5e6-96231b3b80d8