fix callgraph dump to not print 0x0x1234 for nodes.

fix callgraph dump to not print 0x0x1234 for nodes.
Add the instruction pointer value for debuggability.
We now get dump output that looks like this:

Call graph node for function: 'f1'<<0x1017086b0>>  #uses=1
  CS<0x1017046f8> calls external node

Call graph node for function: '_ZNSt6vectorIdSaIdEEC1EmRKdRKS0_'<<0x1017086f0>>  #uses=1
  CS<0x0> calls external node

Call graph node for function: 'f4'<<0x1017087a0>>  #uses=1
  CS<0x101708c88> calls function 'f3'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102194 91177308-0d34-0410-b5e6-96231b3b80d8