Starting to cleanup includes a bit. Still a mess.

src/alloy/hir/value.cc

@@ -136,7 +136,7 @@ void Value::SignExtend(TypeName target_type) {
           return;
       }
     default:
-      XEASSERTUNHANDLEDCASE();
+      XEASSERTUNHANDLEDCASE(type);
       return;
   }
 }

src/alloy/hir/value.h

@@ -49,7 +49,7 @@ static size_t GetTypeSize(TypeName type_name) {
       return 16;
     default:
       XEASSERTUNHANDLEDCASE(type_name);
-      break;
+      return 0;
   }
 }