Make Kernel Source Code Discoverable - #514
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The pass now resolves the source path of the non-LTO translation-unit module to an absolute real path before embedding it. Consumers of the embedded bitcode, such as Mneme's recorder, can then locate the kernel's translation unit without knowing the compile working directory. Only the emitted clone is modified; the original module keeps its name so getUniqueFileID and host/device matching are unchanged. The path is already part of the module hash, so hashes only change when the compile was invoked with a relative path or a path through a symlink.
The cleanup pipelines stripped all debug info from device modules, so the bitcode that Mneme embeds and records carried no source information and a recorded kernel could not be traced back to the code that defined it. Downgrade to line tables instead of stripping, in the pass cleanup pipeline, in the HIP RDC/LTO pruned module, and in the runtime cleanup pipeline. That keeps each kernel's DISubprogram and DIFile, including the compile-time MD5 checksum, while dropping the type and variable debug info that made modules large.
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Embed the source filename into the resulting module. This can be helpful for downstream users such as Mneme to find the original kernel source code.