add fuse_multi_transformer passes to fp16. test=develop (#47676)

paddle/fluid/inference/api/paddle_pass_builder.cc

@@ -170,6 +170,12 @@ const std::vector<std::string> kGpuLowerPrecisionPasses{
     "conv_elementwise_add2_act_fuse_pass",
     "conv_elementwise_add_fuse_pass",
     "multihead_matmul_fuse_pass_v2",
+    "fused_multi_transformer_encoder_pass",
+    "fused_multi_transformer_decoder_pass",
+    "fused_multi_transformer_encoder_fuse_qkv_pass",
+    "fused_multi_transformer_decoder_fuse_qkv_pass",
+    "multi_devices_fused_multi_transformer_encoder_fuse_qkv_pass",
+    "multi_devices_fused_multi_transformer_decoder_fuse_qkv_pass",
     "gpu_cpu_map_matmul_v2_to_mul_pass",
     "gpu_cpu_map_matmul_v2_to_matmul_pass",
     "fc_fuse_pass",