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[gomp4] PTX target format


I've committed this to gomp4 branch. It changes the ptx target data format from a string array with embedded NULs, to an array of pointers & sizes to separate strings for each object file. This avoids the use of strlen when loading onto the PTX device.

Not incrementing the PTX version number, as that just got incremented for the launch API change.

nathan

Attachment: gomp4-ptxobj.diff
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