[clang] [clang-format] Honor new lines before // clang-format on (PR #218022)

[via cfe-commits]

================
@@ -22420,6 +22420,14 @@ TEST_F(FormatTest, DisableRegions) {
                  " #endif\n"
                  "#endif\n"
                  "// clang-format on");
+
+  verifyNoChange("// clang-format off\n"
+                 "int i;\n"
+                 "\n"
+                 "\n"
+                 "\n"
+                 "\n"
----------------
owenca wrote:

```suggestion
                 "\n"
                 "\n"
                 " int  i ;\n"
                 "\n"
                 "\n"
```
would have better coverage, IMO.

https://github.com/llvm/llvm-project/pull/218022
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