default skip y point to r (#2457)

Co-authored-by: Thomas Ning <Thomas.Ning@amd.com>

[ROCm/composable_kernel commit: 0aecb5ab68]

include/ck_tile/core/config.hpp

@@ -263,3 +263,9 @@
 #ifndef CK_TILE_WA_ISSUE_2028
 #define CK_TILE_WA_ISSUE_2028 0
 #endif
+
+// Y pointed to R, we don't see a valuable use case.
+// Will enforce encoding to check Y not pointed to R if set to zero
+#ifndef CK_TILE_ENC_SUPPORT_Y_TO_R
+#define CK_TILE_ENC_SUPPORT_Y_TO_R 0
+#endif

include/ck_tile/core/tensor/tile_distribution_encoding.hpp

@@ -47,6 +47,11 @@ struct tile_distribution_encoding
     static constexpr auto ys_to_rhs_major_  = Ys2RHsMajor{};
     static constexpr auto ys_to_rhs_minor_  = Ys2RHsMinor{};
 
+#if !CK_TILE_ENC_SUPPORT_Y_TO_R
+    static_assert(container_find(ys_to_rhs_major_, 0) == NDimY,
+                  "do not support Y dim pointed to R dim");
+#endif
+
     // redundant but useful info
     // TODO: really bad code, should be over-hauled
     struct detail