[llvm] [NFC] Add llvm_unreachable to getRCPrefix (PR #106822)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-directx

Author: Damyan Pepper (damyanp)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/106822.diff


1 Files Affected:

- (modified) llvm/lib/Target/DirectX/DXILPrettyPrinter.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Target/DirectX/DXILPrettyPrinter.cpp b/llvm/lib/Target/DirectX/DXILPrettyPrinter.cpp
index f282eff6c002b2..0478dc2df988de 100644
--- a/llvm/lib/Target/DirectX/DXILPrettyPrinter.cpp
+++ b/llvm/lib/Target/DirectX/DXILPrettyPrinter.cpp
@@ -45,6 +45,7 @@ static StringRef getRCPrefix(dxil::ResourceClass RC) {
   case dxil::ResourceClass::Sampler:
     return "s";
   }
+  llvm_unreachable("covered switch");
 }
 
 static StringRef getFormatName(const dxil::ResourceInfo &RI) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/106822