[clang] [Clang] Replace include with forward declaration (NFC) (PR #151292)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Nikita Popov (nikic)

<details>
<summary>Changes</summary>

After https://github.com/llvm/llvm-project/pull/142541.

---
Full diff: https://github.com/llvm/llvm-project/pull/151292.diff


1 Files Affected:

- (modified) clang/include/clang/AST/Expr.h (+1-1) 


``````````diff
diff --git a/clang/include/clang/AST/Expr.h b/clang/include/clang/AST/Expr.h
index 708c6e2925fd0..6c124aa96cdb4 100644
--- a/clang/include/clang/AST/Expr.h
+++ b/clang/include/clang/AST/Expr.h
@@ -16,7 +16,6 @@
 #include "clang/AST/APNumericStorage.h"
 #include "clang/AST/APValue.h"
 #include "clang/AST/ASTVector.h"
-#include "clang/AST/Attr.h"
 #include "clang/AST/ComputeDependence.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclAccessPair.h"
@@ -58,6 +57,7 @@ namespace clang {
   class StringLiteral;
   class TargetInfo;
   class ValueDecl;
+  class WarnUnusedResultAttr;
 
 /// A simple array of base specifiers.
 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;

``````````

</details>


https://github.com/llvm/llvm-project/pull/151292