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* Add cuda codegen bug repro
This just compiles tests/compute/simlpe.slang for PTX with the new compilation API, in
order to reproduce a code generation bug.
* Detect entrypoint more robustly when applying ConstRef hack during lowring
For shaders like tests/compute/simple.slang, which have a 'numthreads' attribute but no
'shader' attribute, the old compile request API would add an EntryPointAttribute to the
AST node of the entry point. However, the new API doesn't, and so a certain ConstRef hack
doesn't get applied when using the new API, leading to subsequent code generation issues.
This patch also checks for a 'numthreads' attribute when deciding whether to apply the
ConstRef hack.
This closes issue #6507 and helps to resolve issue #4760.
* Add expected failure list for GitHub runners
Our GitHub runners don't have the CUDA toolkits installed, so they can't run all tests.
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