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* Initial steps on GPU printing example
This change is checkpointing work on a new Slang example that shows how a "GPU `printf()`" can be implemented almost entirely in user space thanks to a combination of Slang language and API features.
The example is not perfect as it stands today due to limitations in our current handling of hashed string literals:
* At call sites where a string literal is passed, we currently have to explicitly invoke `getStringHash()` to get the hash code, because we don't currently support `String` as a function argument/parameter type.
* On the implementation side, because strings are passed as their `int` hash codes, we can't tell them apart from ordinary `int` arguments. The current code handles this by assuming an `int` is *always* a hashed string, which obviously isn't appropriate.
There are plenty of other limitations in the implementation presented, but the above are the two main things I'd like to address in follow-up work.
I would like to checkpoint this work on the application first, in order to keep work on the Slang implementation and the example as separate as possible.
* typo
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