[clang] clang-format: Add splitting for strings with user-defined suffixes (PR #167150)

[Björn Schäpers via cfe-commits]

================
@@ -274,15 +276,21 @@ class BreakableStringLiteral : public BreakableToken {
 protected:
   // The column in which the token starts.
   unsigned StartColumn;
-  // The prefix a line needs after a break in the token.
+  // The prefix a line needs at the start
----------------
HazardyKnusperkeks wrote:

```suggestion
  // The prefix a line needs at the start.
```

https://github.com/llvm/llvm-project/pull/167150