gold: x86_64-nacl: Correct 9-byte nop sequence to match what the assembler generates.

gold/
	* x86_64.cc (Output_data_plt_x86_64_nacl::first_plt_entry):
	Correct 9-byte nop sequence to match what the assembler generates.

(cherry picked from commit dd0845d708ab82f931fd7b800b4d218842ed635f)