When we truncate a source line to fit it within the terminal width,

show an ellipsis where we have removed text. An example:

/Users/dgregor/Projects/llvm/tools/clang/test/Misc/message-length.c:18:120:
warning: 
      comparison of distinct pointer types ('int *' and 'float *')
  ...a_func_to_call(ip == FloatPointer, ip[ALongIndexName], ...
                    ~~ ^  ~~~~~~~~~~~~

llvm-svn: 70655