webgpu : reorder includes since V that appears in common_decls.tmpl may be defined as K in flash_attn_decls.tmpl if KV_OVERLAP (llama/27545)

Co-authored-by: Stanisław Szymczyk <sszymczy@gmail.com>

ggml/src/ggml-webgpu/wgsl-shaders/flash_attn.wgsl

@@ -5,10 +5,9 @@ enable subgroups;
 enable chromium_experimental_subgroup_matrix;
 
 #define BYTE_HELPERS
-#include "common_decls.tmpl"
-
 #define FLASH_ATTN_SCALAR_KV
 #include "flash_attn_decls.tmpl"
+#include "common_decls.tmpl"
 
 // Default values
 // The actual values are defined in shader-lib.

ggml/src/ggml-webgpu/wgsl-shaders/flash_attn_tile.wgsl

@@ -2,8 +2,8 @@ enable f16;
 enable subgroups;
 
 #define BYTE_HELPERS
-#include "common_decls.tmpl"
 #include "flash_attn_decls.tmpl"
+#include "common_decls.tmpl"
 
 // Default values
 // The actual values are defined in shader-lib.

ggml/src/ggml-webgpu/wgsl-shaders/flash_attn_vec_split.wgsl

@@ -3,9 +3,9 @@ enable f16;
 enable subgroups;
 
 #define BYTE_HELPERS
-#include "common_decls.tmpl"
 #define FLASH_ATTN_VEC_SPLIT
 #include "flash_attn_decls.tmpl"
+#include "common_decls.tmpl"
 
 // Default values
 // The actual values are defined in shader-lib.