[PM] Reformat this code with clang-format so that subsequent changes

[PM] Reformat this code with clang-format so that subsequent changes
don't get muddied up by formatting changes.

Some of these don't really seem like improvements to me, but they also
don't seem any worse and I care much more about not formatting them
manually than I do about the particular formatting. =]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226610 91177308-0d34-0410-b5e6-96231b3b80d8