[llvm] [NFC][MC] Use `llvm_unreachable` for unreachable case (PR #152930)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-mc

Author: Abhishek Kaushik (abhishek-kaushik22)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/152930.diff


1 Files Affected:

- (modified) llvm/lib/MC/MCAsmInfoGOFF.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/MC/MCAsmInfoGOFF.cpp b/llvm/lib/MC/MCAsmInfoGOFF.cpp
index 0a5d1927b1a22..d0f931d03d532 100644
--- a/llvm/lib/MC/MCAsmInfoGOFF.cpp
+++ b/llvm/lib/MC/MCAsmInfoGOFF.cpp
@@ -72,7 +72,7 @@ static void emitCATTR(raw_ostream &OS, StringRef Name, GOFF::ESDRmode Rmode,
       OS << "64";
       break;
     case GOFF::ESD_RMODE_None:
-      break;
+      llvm_unreachable("GOFF::ESD_RMODE_None should not be handled here");
     }
     OS << ')';
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/152930