[clang] [CIR][NFC] Fix warning about unhandled Decl (PR #140159)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clangir

Author: Andy Kaylor (andykaylor)

<details>
<summary>Changes</summary>

This fixes a warning about an unhandled Decl that was recently introduced. While adding the new decl, I noticed that one of the others that was in the "NYI" group belonged in the "unreachable" group, so I moved it also.

---
Full diff: https://github.com/llvm/llvm-project/pull/140159.diff


1 Files Affected:

- (modified) clang/lib/CIR/CodeGen/CIRGenDecl.cpp (+2-1) 


``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenDecl.cpp b/clang/lib/CIR/CodeGen/CIRGenDecl.cpp
index 498d7533c2204..61af33053dc0a 100644
--- a/clang/lib/CIR/CodeGen/CIRGenDecl.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenDecl.cpp
@@ -322,6 +322,8 @@ void CIRGenFunction::emitDecl(const Decl &d) {
   case Decl::ObjCTypeParam:
   case Decl::Binding:
   case Decl::UnresolvedUsingIfExists:
+  case Decl::HLSLBuffer:
+  case Decl::HLSLRootSignature:
     llvm_unreachable("Declaration should not be in declstmts!");
 
   case Decl::Function:     // void X();
@@ -374,7 +376,6 @@ void CIRGenFunction::emitDecl(const Decl &d) {
     return;
   }
   case Decl::ImplicitConceptSpecialization:
-  case Decl::HLSLBuffer:
   case Decl::TopLevelStmt:
   case Decl::UsingPack:
   case Decl::Decomposition: // This could be moved to join Decl::Var

``````````

</details>


https://github.com/llvm/llvm-project/pull/140159