Improve the OOP ABI

[Walter Bright]

On 1/22/2024 3:31 PM, deadalnix wrote:
> I don't see what using a different hash function would buy us. I doubt the hash 
> of class name would be anywhere close to the bottleneck in term of speed.

The hash also happens at compile time, not runtime. The only thing I would 
prefer is a hash that's 64 bits instead of 128, so it's one less compare 
instruction.