clang-format: Force line break between "endl" and "<<".

clang-format: Force line break between "endl" and "<<".

This makes piped output easier to read in many instances.

Before:
  llvm::errs() << aaaa << std::endl << bbbb << std::endl;

After:
  llvm::errs() << aaaa << std::endl
               << bbbb << std::endl;

Also fix a few instance of "don't use else after return" as per the
coding standards.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@225444 91177308-0d34-0410-b5e6-96231b3b80d8