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This pull request is the first part of an ongoing effort to extends PGO instrumentation to GPU device code. This PR makes the following changes: - Adds blank registration functions to device RTL - Gives PGO globals protected visibility when targeting a supported GPU - Handles any addrspace casts for PGO calls - Implements PGO global extraction in GPU plugins (currently only dumps info) These changes can be tested by supplying `-fprofile-instrument=clang` while targeting a GPU.