[clang] [clang] Use a formatted_raw_ostream in TextDiagnostic (PR #164935)

[via cfe-commits]

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@@ -16,6 +16,7 @@
 #include "clang/Frontend/TextDiagnostic.h"
 #include "clang/Lex/Lexer.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
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Sirraide wrote:

This doesn’t appear to be used considering that this is the only diff in this file?

https://github.com/llvm/llvm-project/pull/164935