[clang-format] Emit absolute splits before lines for comments

[clang-format] Emit absolute splits before lines for comments

Summary:
This patch makes the splits emitted for the beginning of comment lines during
reformatting absolute. Previously, they were relative to the start of the
non-whitespace content of the line, which messes up further TailOffset
calculations in breakProtrudingToken. This fixes an assertion failure reported
in bug 34236: https://bugs.llvm.org/show_bug.cgi?id=34236.

Reviewers: djasper

Reviewed By: djasper

Subscribers: klimek, cfe-commits

Differential Revision: https://reviews.llvm.org/D36956

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@311559 91177308-0d34-0410-b5e6-96231b3b80d8