Replace LINQ's .Any() with foreach in Encode

[aradalvand]

Related: 7b6be39#commitcomment-127208505

[aradalvand]

@LeaFrock Does this look good?
I chose foreach instead of for because I think a foreach on an array gets lowered to a for by the compiler, if I'm not mistaken. But feel free to correct me.

[LeaFrock]

a foreach on an array gets lowered to a for by the compiler

No 😄 . for is always the fastest. But for an array/list, the compiler will make foreach the same as for.

Originally, I just wanted to replace Any with Array.Exists. for or foreach requires more code lines after all. The key point is that Any has extra memory allocation. The CPU-perf gap between them can be ignored as it's too small compared to the Encode algorithm.

Since you've adopted foreach, it's perfect anyway.