Cleanup some GraphTraits iteration code

Use children<> and nodes<> in appropriate places to cleanup the code.

Also, as part of the cleanup,
change the signature of DominatorTreeBase's Split.
It is a protected non-virtual member function called only twice,
both from within the class,
and the removed passed argument in both cases is '*this'.
The reason for the existence of that argument seems to be that
back before r43115 Split was a free function,
so an argument to get '*this' was needed - but now that is no longer the
case.

Patch by Yoav Ben-Shalom!

Differential Revision: https://reviews.llvm.org/D32118

llvm-svn: 300656

0 files changed, 0 insertions, 0 deletions