[analyzer] Do a better job describing C++ member functions in the call stack.

Examples:
  Calling constructor for 'Foo'
  Entered call from 'Foo::create'

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172832 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed