private_typeinfo: add missing field initializers

Cleanup the -Wmissing-field-initializers warnings from gcc:7 builds.
NFC.

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@305172 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/private_typeinfo.cpp b/src/private_typeinfo.cpp
index 58a2b0d..08e2b45 100644
--- a/src/private_typeinfo.cpp
+++ b/src/private_typeinfo.cpp
@@ -229,7 +229,7 @@
     if (thrown_class_type == 0)
         return false;
     // bullet 2
-    __dynamic_cast_info info = {thrown_class_type, 0, this, -1, 0};
+    __dynamic_cast_info info = {thrown_class_type, 0, this, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,};
     info.number_of_dst_type = 1;
     thrown_class_type->has_unambiguous_public_base(&info, adjustedPtr, public_path);
     if (info.path_dst_ptr_to_static_ptr == public_path)
@@ -427,7 +427,7 @@
         dynamic_cast<const __class_type_info*>(thrown_pointer_type->__pointee);
     if (thrown_class_type == 0)
         return false;
-    __dynamic_cast_info info = {thrown_class_type, 0, catch_class_type, -1, 0};
+    __dynamic_cast_info info = {thrown_class_type, 0, catch_class_type, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,};
     info.number_of_dst_type = 1;
     thrown_class_type->has_unambiguous_public_base(&info, adjustedPtr, public_path);
     if (info.path_dst_ptr_to_static_ptr == public_path)
@@ -633,7 +633,7 @@
     //    be returned.
     const void* dst_ptr = 0;
     // Initialize info struct for this search.
-    __dynamic_cast_info info = {dst_type, static_ptr, static_type, src2dst_offset, 0};
+    __dynamic_cast_info info = {dst_type, static_ptr, static_type, src2dst_offset, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,};
 
     // Find out if we can use a giant short cut in the search
     if (is_equal(dynamic_type, dst_type, false))