Eliminate the internal command-line option for viewing inheritance in C++...

Eliminate the internal command-line option for viewing inheritance in C++ classes, since it's only really worked for the trivial cases anyway due to lame pseudo-parsing of the class name. The viewInheritance() function is still available for use in the debugger, where this is far more useful

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@125762 91177308-0d34-0410-b5e6-96231b3b80d8