Fix MSVC "not all control paths return a value" warning. NFC.

RKSimon · RKSimon · commit a777a93118a0 · 2024-08-29T17:31:55.000+01:00
diff --git a/llvm/utils/TableGen/IntrinsicEmitter.cpp b/llvm/utils/TableGen/IntrinsicEmitter.cpp
@@ -451,6 +451,7 @@ static AttributeSet getIntrinsicArgAttributeSet(LLVMContext &C, unsigned ID) {
         case CodeGenIntrinsic::Dereferenceable:
           return "Dereferenceable";
         }
+        llvm_unreachable("Unknown CodeGenIntrinsic::ArgAttrKind enum");
       };
 
       OS << formatv(R"(

Original file line number	Diff line number	Diff line change
`@@ -451,6 +451,7 @@ static AttributeSet getIntrinsicArgAttributeSet(LLVMContext &C, unsigned ID) {`
`451`	`451`	`case CodeGenIntrinsic::Dereferenceable:`
`452`	`452`	`return "Dereferenceable";`
`453`	`453`	`}`
	`454`	`+ llvm_unreachable("Unknown CodeGenIntrinsic::ArgAttrKind enum");`
`454`	`455`	`};`
`455`	`456`
`456`	`457`	`OS << formatv(R"(`