C++: fix parsing nested C99 designated initializers.

Change-Id: Iaa0e7550abf6be77601b1852652bb3d0731d0323
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/libs/3rdparty/cplusplus/Parser.cpp

@@ -5696,7 +5696,13 @@ bool Parser::parseDesignatedInitializer(ExpressionAST *&node)
 
     if (LA() == T_EQUAL) {
         ast->equal_token = consumeToken();
-        if (parseAssignmentExpression(ast->initializer)) {
+
+        if (LA() == T_LBRACE) {
+            if (parseBracedInitList0x(node)) {
+                node = ast;
+                return true;
+            }
+        } else if (parseAssignmentExpression(ast->initializer)) {
             node = ast;
             return true;
         }

tests/auto/cplusplus/c99/data/designatedInitializer.1.c

@@ -7,3 +7,12 @@ int a[10] = {2, 4, [8]=9, 10};
 int a[MAX] = {
     1, 3, 5, 7, 9, [MAX-5] = 8, 6, 4, 2, 0
 };
+struct {
+    int table [3];
+    struct {
+        int a;
+        int b;
+    } parts;
+} a[MAX] = {
+    [2] = { .table = { 8, [1] = 7, 6 }, .parts = { .a = 0, 1 } }
+};