Switch assert(0/false) llvm_unreachable.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140367 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndexUSRs.cpp b/tools/libclang/CIndexUSRs.cpp
index 464dbb0..f32063c 100644
--- a/tools/libclang/CIndexUSRs.cpp
+++ b/tools/libclang/CIndexUSRs.cpp
@@ -320,7 +320,7 @@
 void USRGenerator::VisitObjCContainerDecl(ObjCContainerDecl *D) {
   switch (D->getKind()) {
     default:
-      assert(false && "Invalid ObjC container.");
+      llvm_unreachable("Invalid ObjC container.");
     case Decl::ObjCInterface:
     case Decl::ObjCImplementation:
       GenObjCClass(D->getName());