[clang-format] Emit absolute splits before lines for comments, try 2

Summary:
This recommits https://reviews.llvm.org/D36956 with an update to the added test
case to not use raw string literals, since this makes gcc unhappy.

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D37109

llvm-svn: 311672
diff --git a/clang/lib/Format/BreakableToken.cpp b/clang/lib/Format/BreakableToken.cpp
index 20e3e5b..b9e48e6 100644
--- a/clang/lib/Format/BreakableToken.cpp
+++ b/clang/lib/Format/BreakableToken.cpp
@@ -545,15 +545,18 @@
 }
 
 BreakableToken::Split BreakableBlockComment::getSplitBefore(
-    unsigned LineIndex,
-    unsigned PreviousEndColumn,
-    unsigned ColumnLimit,
+    unsigned LineIndex, unsigned PreviousEndColumn, unsigned ColumnLimit,
     llvm::Regex &CommentPragmasRegex) const {
   if (!mayReflow(LineIndex, CommentPragmasRegex))
     return Split(StringRef::npos, 0);
   StringRef TrimmedContent = Content[LineIndex].ltrim(Blanks);
-  return getReflowSplit(TrimmedContent, ReflowPrefix, PreviousEndColumn,
-                        ColumnLimit);
+  Split Result = getReflowSplit(TrimmedContent, ReflowPrefix, PreviousEndColumn,
+                                ColumnLimit);
+  // Result is relative to TrimmedContent. Adapt it relative to
+  // Content[LineIndex].
+  if (Result.first != StringRef::npos)
+    Result.first += Content[LineIndex].size() - TrimmedContent.size();
+  return Result;
 }
 
 unsigned BreakableBlockComment::getReflownColumn(
@@ -633,17 +636,12 @@
         /*CurrentPrefix=*/ReflowPrefix, InPPDirective, /*Newlines=*/0,
         /*Spaces=*/0);
     // Check if we need to also insert a break at the whitespace range.
-    // For this we first adapt the reflow split relative to the beginning of the
-    // content.
     // Note that we don't need a penalty for this break, since it doesn't change
     // the total number of lines.
-    Split BreakSplit = SplitBefore;
-    BreakSplit.first += TrimmedContent.data() - Content[LineIndex].data();
     unsigned ReflownColumn =
         getReflownColumn(TrimmedContent, LineIndex, PreviousEndColumn);
-    if (ReflownColumn > ColumnLimit) {
-      insertBreak(LineIndex, 0, BreakSplit, Whitespaces);
-    }
+    if (ReflownColumn > ColumnLimit)
+      insertBreak(LineIndex, 0, SplitBefore, Whitespaces);
     return;
   }