impAssignTempGen changes source type

[sandreenko]

    struct A
    {        
        public int a;
        public int b;
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    static A foo()
    {
        A a = new A();
        a.a = 1;
        a.b = 2;
        return a;
    }

    public static int Main()
    {       
        return foo().a;
    }

call return result will be saved into local variable.
impAssignTempGen will change call->getType() from struct to long.
It is not good code. There are many workarounds for this behavior.