[llvm-symbolizer] Make the output with -output-style=GNU closer to addr2line's

This patch addresses two differences in the output of llvm-symbolizer
and GNU's addr2line:

* llvm-symbolizer prints an empty line after the report for an address.

* With "-f -i=0", llvm-symbolizer replaces the name of an inlined
  function with the name from the symbol table, i. e., the top caller
  function in the inlining chain. addr2line preserves the name of the
  inlined function.

Differential Revision: https://reviews.llvm.org/D60770

llvm-svn: 358747