[SYCL][CUDA] Allow "ptx" as device object format

[stefanatwork]

This allows one to compile SYCL device code to plain PTX directly: -fsycl-targets=nvptx64-nvidia-cuda -fsycl-device-obj=ptx -S

[stefanatwork]

This PR is intended to address #8797

[mdtoguchi]

@stefanatwork, could you add a test?

[jinz2014]

@mdtoguchi Could you please explain what the test looks like ? Thanks.

[mdtoguchi]

@mdtoguchi Could you please explain what the test looks like ? Thanks.

The test would use the option -fsycl-device-obj=ptx and verify the behaviors being performed in the driver (usually by verifying the -ccc-print-phases or expected -### output).

I also noticed that there is no documentation of this new argument - do we need to update the -help information or user guide?

[jinz2014]

@mdtoguchi Could you please explain what the test looks like ? Thanks.

The test would use the option -fsycl-device-obj=ptx and verify the behaviors being performed in the driver (usually by verifying the -ccc-print-phases or expected -### output).

I also noticed that there is no documentation of this new argument - do we need to update the -help information or user guide?

It is a good idea to add the new argument to the doc/help! Not familiar with driver test, I will ping @npmiller @jchlanda. Thanks.

[jchlanda]

@mdtoguchi Could you please explain what the test looks like ? Thanks.

The test would use the option -fsycl-device-obj=ptx and verify the behaviors being performed in the driver (usually by verifying the -ccc-print-phases or expected -### output).
I also noticed that there is no documentation of this new argument - do we need to update the -help information or user guide?

It is a good idea to add the new argument to the doc/help! Not familiar with driver test, I will ping @npmiller @jchlanda. Thanks.

WRT the test, you could look at how different phases are inspected in: https://github.com/intel/llvm/blob/sycl/clang/test/Driver/sycl-spirv-obj.cpp#L1 (that's with the use of -ccc-print-phases switch) and make sure that it matches your expectation.

[al42and]

Could this new flag be used in the "normal" SYCL flow, not to produce PTX, but to do the device code compilation per-object, before the linking stage?

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[jchlanda]

I've resurrected this patch here: #17390