[clang] Add IWYU export pragma to Type.h (PR #159154)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kim Gräsman (kimgr)

<details>
<summary>Changes</summary>

According to 249167a8982afc3f55237baf1532c5c8ebd850b3, users are expected to include Type.h, which acts as a facade header for TypeBase.h.

Add an IWYU export pragma to help IWYU reason about the relationship.

---
Full diff: https://github.com/llvm/llvm-project/pull/159154.diff


1 Files Affected:

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


``````````diff
diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
index 48575c1b19395..df106d5b12c8d 100644
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -19,7 +19,7 @@
 
 #include "clang/AST/Decl.h"
 #include "clang/AST/DeclCXX.h"
-#include "clang/AST/TypeBase.h"
+#include "clang/AST/TypeBase.h" // IWYU pragma: export
 
 namespace clang {
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/159154