metal: Change im2col offset types from int32_t to uint64_t to support larger memory offsets

Author: alexju

ggml/src/ggml-metal/ggml-metal-impl.h

@@ -286,8 +286,8 @@ typedef struct {
 } ggml_metal_kargs_rms_norm;
 
 typedef struct {
-    int32_t  ofs0;
-    int32_t  ofs1;
+    uint64_t  ofs0;
+    uint64_t  ofs1;
     int32_t  IW;
     int32_t  IH;
     int32_t  CHW;

ggml/src/ggml-metal/ggml-metal.m

@@ -3278,8 +3278,8 @@ static void ggml_metal_encode_node(
 
                 const int32_t CHW = IC * KH * KW;
 
-                const int32_t ofs0 = src1->nb[is_2D ? 3 : 2] / 4;
-                const int32_t ofs1 = src1->nb[is_2D ? 2 : 1] / 4;
+                const uint64_t ofs0 = src1->nb[is_2D ? 3 : 2] / 4;
+                const uint64_t ofs1 = src1->nb[is_2D ? 2 : 1] / 4;
 
                 id<MTLComputePipelineState> pipeline = ctx->kernels[GGML_METAL_KERNEL_TYPE_IM2COL_F32].pipeline;