Improve the `-filter-print-funcs` option to skip the banner for CGSCC pass...

Improve the `-filter-print-funcs` option to skip the banner for CGSCC pass when nothing is to be printed

Before, it would print a sequence of:

  *** IR Dump After Function Integration/Inlining ******
  *** IR Dump After Function Integration/Inlining ******
  *** IR Dump After Function Integration/Inlining ******
  ...

for every single function in the module.

llvm-svn: 292442