Find symbol under cursor and syntax highlight doesn't work in omp pragma

Before Qt Creator 4.9.0 version, there is a Clang-Tidy compile error bug, see  [22136](QTCREATORBUG-22136) for more info.

Now, after I upgraded to 4.9.0, the compiler errors fixed, but I found that find symbol under cursor and syntax highlight doesn't work. 

sample code:

std::cout << "Hello World!" << std::endl;
std::out_of_range("123");
printf("test\n");
#pragma omp parallel
{
   std::cout << "Hello World!" << std::endl;
   std::out_of_range("123");
   printf("test\n");
}

Two problems:

1. all code in `#pragma omp parallel`  doesn't have syntax highlight
2. code from <iostream> can't jump to the declaration, both F2 or right click doesn't work. On the other hand, other code works fine

please see blow gif for more info.