vulkan: Fuse mul_mat_id+add_id+mul and mul_mat+add+add. (#17287)

These both show up in gpt-oss. Also, cleanup the mul_mat_vec fusion code a bit.

ggml/src/ggml-vulkan/vulkan-shaders/mul_mat_vec_iface.glsl

@@ -0,0 +1,33 @@
+#include "types.glsl"
+
+#define MAT_VEC_FUSION_FLAGS_BIAS0 0x1
+#define MAT_VEC_FUSION_FLAGS_BIAS1 0x2
+#define MAT_VEC_FUSION_FLAGS_SCALE0 0x4
+#define MAT_VEC_FUSION_FLAGS_SCALE1 0x8
+
+#ifndef MMQ
+layout (binding = 0) readonly buffer A {A_TYPE data_a[];};
+#if defined(A_TYPE_VEC4)
+layout (binding = 0) readonly buffer AV4 {A_TYPE_VEC4 data_a_v4[];};
+#endif
+#else
+layout (binding = 0) readonly buffer A {A_TYPE_PACKED16 data_a[];};
+#endif
+
+layout (binding = 1) readonly buffer B {B_TYPE data_b[];};
+#ifdef B_TYPE_VEC2
+layout (binding = 1) readonly buffer BV2 {B_TYPE_VEC2 data_b_v2[];};
+#endif
+#ifdef B_TYPE_VEC4
+layout (binding = 1) readonly buffer BV4 {B_TYPE_VEC4 data_b_v4[];};
+#endif
+
+layout (binding = 2) writeonly buffer D {D_TYPE data_d[];};
+
+layout (binding = 3) readonly buffer Fuse0 {D_TYPE data_fuse0[];};
+layout (binding = 4) readonly buffer Fuse1 {D_TYPE data_fuse1[];};
+
+#ifdef MUL_MAT_ID
+layout (binding = 5) readonly buffer IDS {int data_ids[];};
+#endif
+