[Driver] Dump device code during SYCL offloading.

[srividya-sundaram]

This PR enables users to dump the device code generated during the SYCL compilation into a user provided directory.
The new option added is : -fsycl-dump-device-code=/path/to/directory/

Example usage:
If somebody runs : clang++ -fsycl -fsycl-dump-device-code=/path/to/directory test.cpp

the *.spv files generated during device compilation show up in /path/to/directory/

[srividya-sundaram]

@intel/llvm-gatekeepers Hello, this is ready for merge.
The SYCL Pre Commit on Windows / e2e / Intel GEN12 Graphics with Level Zero job has been in the "waiting" status
for several days even after re-starting the job multiple times.

Waiting for review: WindowsCILock needs approval to start deploying changes.

Any tip to get this job running?

[steffenlarsen]

Hi @srividya-sundaram ! Due to CI issues we are currently manually letting windows jobs through. Restarting the jobs only places the runs behind the queue. Additionally, if you don't manually cancel your old processes they may get approved and eat resources, making the wait longer. We apologize for the inconvenience and will get to the runs related to this PR ASAP.

[hchilama]

@intel/llvm-gatekeepers This is ready to merge.

[srividya-sundaram]

Hi @srividya-sundaram ! Due to CI issues we are currently manually letting windows jobs through. Restarting the jobs only places the runs behind the queue. Additionally, if you don't manually cancel your old processes they may get approved and eat resources, making the wait longer. We apologize for the inconvenience and will get to the runs related to this PR ASAP.

Thanks @steffenlarsen . I learnt about the Windows CI lock from Stewart offline.