Fix bug in LineList end locations

LineList Line end locations were getting cut off too early because they were
based on the untrimmed (w.r.t. comment markers) locations, instead of the
trimmed one.

Author: bitjammer

lib/Markup/LineList.cpp

@@ -97,7 +97,7 @@ LineList MarkupContext::getLineList(swift::RawComment RC) {
       auto CleanedStartLoc =
           C.Range.getStart().getAdvancedLocOrInvalid(CommentMarkerBytes);
       auto CleanedEndLoc =
-          C.Range.getStart().getAdvancedLocOrInvalid(Cleaned.size());
+          CleanedStartLoc.getAdvancedLocOrInvalid(Cleaned.size());
       Builder.addLine(Cleaned, { CleanedStartLoc, CleanedEndLoc });
     } else {
       // Skip comment markers at the beginning and at the end.
@@ -139,13 +139,13 @@ LineList MarkupContext::getLineList(swift::RawComment RC) {
         StringRef Line = Cleaned.substr(0, Pos);
         auto CleanedEndLoc = CleanedStartLoc.getAdvancedLocOrInvalid(Pos);
 
+        Builder.addLine(Line, { CleanedStartLoc, CleanedEndLoc });
+
         Cleaned = Cleaned.drop_front(Pos);
         unsigned NewlineBytes = swift::measureNewline(Cleaned);
         Cleaned = Cleaned.drop_front(NewlineBytes);
         Pos += NewlineBytes;
         CleanedStartLoc = CleanedStartLoc.getAdvancedLocOrInvalid(Pos);
-
-        Builder.addLine(Line, { CleanedStartLoc, CleanedEndLoc });
       }
     }
   }