[clang] HLSLResource.h - fix MSVC "not all control paths return a value" warning. NFC. (PR #179203)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Simon Pilgrim (RKSimon)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/179203.diff


1 Files Affected:

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


``````````diff
diff --git a/clang/include/clang/AST/HLSLResource.h b/clang/include/clang/AST/HLSLResource.h
index 071e59d72d983d..aedb2cd5db6ba2 100644
--- a/clang/include/clang/AST/HLSLResource.h
+++ b/clang/include/clang/AST/HLSLResource.h
@@ -106,6 +106,7 @@ inline uint32_t getResourceDimensions(llvm::dxil::ResourceDimension Dim) {
     llvm_unreachable(
         "We cannot get the dimension of a resource with unknown dimension.");
   }
+  llvm_unreachable("Unhandled llvm::dxil::ResourceDimension enum.");
 }
 
 } // namespace hlsl

``````````

</details>


https://github.com/llvm/llvm-project/pull/179203