clang-format: Break before 'else' in Stroustrup style.

Seems to be the desired thing to do according to:
  http://www.stroustrup.com/Programming/PPP-style-rev3.pdf

Patch by Jarkko Hietaniemi, thank you!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@214857 91177308-0d34-0410-b5e6-96231b3b80d8