[warning] Don't report function returns address of local variable

[vfdff]

• test: https://gcc.godbolt.org/z/Yz1dTvbhn

int *foo() {
    int *p = 0;
    {
        int x = 0;
        p = &x;
        *p = 42;
    }
    *p = 42;
    return p;
}

• I already use -Wall to report all warning, but the dangling pointer is not identified by clang