[clang] Forward declare TextEncodingConverter in TextEncoding.h (PR #207382)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Abhina Sree (abhina-sree)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/207382.diff


2 Files Affected:

- (modified) clang/include/clang/Lex/TextEncoding.h (+2-1) 
- (modified) clang/lib/Lex/TextEncoding.cpp (+1) 


``````````diff
diff --git a/clang/include/clang/Lex/TextEncoding.h b/clang/include/clang/Lex/TextEncoding.h
index c892d1fadbc38..be10dd36c0fa4 100644
--- a/clang/include/clang/Lex/TextEncoding.h
+++ b/clang/include/clang/Lex/TextEncoding.h
@@ -11,7 +11,8 @@
 
 #include "clang/Basic/LangOptions.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Support/TextEncoding.h"
+
+class llvm::TextEncodingConverter;
 
 enum ConversionAction { CA_NoConversion, CA_ToLiteralEncoding };
 
diff --git a/clang/lib/Lex/TextEncoding.cpp b/clang/lib/Lex/TextEncoding.cpp
index c90ef155f1bd6..8eda19995add6 100644
--- a/clang/lib/Lex/TextEncoding.cpp
+++ b/clang/lib/Lex/TextEncoding.cpp
@@ -8,6 +8,7 @@
 
 #include "clang/Lex/TextEncoding.h"
 #include "clang/Basic/DiagnosticDriver.h"
+#include "llvm/Support/TextEncoding.h"
 
 llvm::TextEncodingConverter *
 TextEncoding::getConverter(ConversionAction Action) const {

``````````

</details>


https://github.com/llvm/llvm-project/pull/207382