add x86 push_word method

git-svn-id: file:///home/svn/framework3/trunk@5932 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/arch/x86.rb

@@ -161,6 +161,13 @@ module X86
 		raise ::ArgumentError, "Can only take signed byte values!", caller()
 	end
 
+	#
+	# This method generates a push word instruction.
+	#
+	def self.push_word(val)
+		return "\x66\x68" + [ val ].pack('v') 
+	end
+
 	#
 	# This method generates a push dword instruction.
 	#