[clang] [clang-format] Fix breaking enum braces when combined with export (PR #189128)

[via cfe-commits]

================
@@ -2885,6 +2885,22 @@ TEST_F(FormatTest, ShortEnums) {
                "  C\n"
                "} ShortEnum1, ShortEnum2;",
                Style);
+
+  Style.AllowShortEnumsOnASingleLine = true;
+  verifyFormat("enum\n"
+               "{\n"
+               "  A,\n"
+               "  B,\n"
+               "  C\n"
+               "} ShortEnum1, ShortEnum2;",
+               Style);
+  verifyFormat("export enum\n"
+               "{\n"
+               "  A,\n"
+               "  B,\n"
+               "  C\n"
+               "} ShortEnum1, ShortEnum2;",
+               Style);
----------------
owenca wrote:

```suggestion
  verifyFormat("export enum class Foo\n"
               "{\n"
               "  foo,\n"
               "  bar\n"
               "};",
               Style);
```
or something like that.

https://github.com/llvm/llvm-project/pull/189128