Don't split printf if %s is static

[lights0123]

This is part of my work on HipScript, where I use this project to run HIP code in the browser with WebGPU.

Using printf with the %s specifier, like in __assert_fail, causes chipStar to split the call into several. For example:

printf("File %s errored\n", "main.hip");
// turns into
printf("File ");
printf("main.hip");
printf(" errored\n");

This causes problems if multiple threads are printing, since these calls can interleave, producing output like:

File File main.hipmain.hip errored
errored

This PR will keep %s specifiers, but only if the argument can be converted to a global string. In my case, where I compile to Vulkan afterwards with Clspv, this allows the compiler to convert the string pointer to an integer ID.

[pjaaskel]

Thanks. The improvement makes sense, but please check my feedback.

[pjaaskel]

Suggested change

	std::string toAdd;
	std::string ToAdd;

[pjaaskel]

Also pls add a comment what is this variable for.

[pjaaskel]

This seems separate from the feature described. Please add a comment what is this code block for.

[pvelesko]

printf unit tests failing fyi