[NFC][IR][AsmWriter] Fix Wreturn-type gcc warning

nullptr-cpp · nullptr-cpp · commit fc4e8a3e8b4a · 2021-01-28T16:42:30.000+08:00
GCC warning:
```
/llvm-project/llvm/lib/IR/AsmWriter.cpp:3175:1: warning: control reaches end of non-void function [-Wreturn-type]
 3175 | }
      | ^
```
diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
@@ -3172,6 +3172,7 @@ static const char *getVisibilityName(GlobalValue::VisibilityTypes Vis) {
   case GlobalValue::ProtectedVisibility:
     return "protected";
   }
+  llvm_unreachable("invalid visibility");
 }
 
 void AssemblyWriter::printFunctionSummary(const FunctionSummary *FS) {

Original file line number	Diff line number	Diff line change
`@@ -3172,6 +3172,7 @@ static const char *getVisibilityName(GlobalValue::VisibilityTypes Vis) {`
`3172`	`3172`	`case GlobalValue::ProtectedVisibility:`
`3173`	`3173`	`return "protected";`
`3174`	`3174`	`}`
	`3175`	`+ llvm_unreachable("invalid visibility");`
`3175`	`3176`	`}`
`3176`	`3177`
`3177`	`3178`	`void AssemblyWriter::printFunctionSummary(const FunctionSummary *FS) {`