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Fixed the bug of having 0 active threads in an issued instruction and counting that as a Pipeline stall#234

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rodhuega wants to merge 1 commit intogpgpu-sim:masterfrom
rodhuega:fix0ActiveThreadsCountingAsStallPipeline
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Fixed the bug of having 0 active threads in an issued instruction and counting that as a Pipeline stall#234
rodhuega wants to merge 1 commit intogpgpu-sim:masterfrom
rodhuega:fix0ActiveThreadsCountingAsStallPipeline

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There was a bug in the shader_core_ctx::issue_warp. It was counting as a Pipeline stall the case of a instruction issued with 0 active lanes.

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