Changed the remaining dead asserts to llvm_unreachable.

llvm-svn: 163039
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 93e07be..2582e13 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -8217,15 +8217,13 @@
 /// WARNING: Indexes apply to particular diagnostics only!
 ///
 /// \returns diagnostic %select index.
-static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag)
-{
+static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) {
   switch (Tag) {
-    case TTK_Struct: return 0;
-    case TTK_Interface: return 1;
-    case TTK_Class:  return 2;
-    default: assert("Invalid tag kind for redecl diagnostic!");
+  case TTK_Struct: return 0;
+  case TTK_Interface: return 1;
+  case TTK_Class:  return 2;
+  default: llvm_unreachable("Invalid tag kind for redecl diagnostic!");
   }
-  return -1;
 }
 
 /// \brief Determine if tag kind is a class-key compatible with