Add enumerator for new pipeline version (optimized pipeline v1)

include/ck/tensor_operation/gpu/grid/gridwise_gemm_pipeline_selector.hpp

@@ -3,6 +3,8 @@
 
 #pragma once
 
+#include <iostream>
+
 #include "ck/tensor_operation/gpu/grid/gridwise_gemm_pipeline_v1.hpp"
 #include "ck/tensor_operation/gpu/grid/gridwise_gemm_pipeline_v2.hpp"
 
@@ -11,9 +13,22 @@ namespace ck {
 enum struct PipelineVersion
 {
     v1,
+    v1_opt0,
     v2,
 };
 
+inline std::ostream& operator<<(std::ostream& stream, PipelineVersion version)
+{
+    switch(version)
+    {
+    case PipelineVersion::v1: return stream << "v1";
+    case PipelineVersion::v1_opt0: return stream << "v1_opt0";
+    case PipelineVersion::v2: return stream << "v2";
+    }
+
+    __builtin_unreachable();
+}
+
 template <PipelineVersion PipelineVer,
           index_t NumPrefetch     = 1,
           LoopScheduler LoopSched = LoopScheduler::Default>
@@ -30,6 +45,10 @@ constexpr auto GridwiseGemmPipeline_Selector()
             return GridwiseGemmPipelineInterwave_v1<NumPrefetch>{};
         }
     }
+    else if constexpr(PipelineVer == PipelineVersion::v1_opt0)
+    {
+        return GridwiseGemmPipeline_v1<NumPrefetch, 0>{};
+    }
     else if constexpr(PipelineVer == PipelineVersion::v2)
     {
         return GridwiseGemmPipeline_v2{};