fixed loading of both dasm_x64 and dasm_x86 in the same luastate (luapower needs this for checking dependencies)

dasm_x64.lua

@@ -1,22 +1,11 @@
-------------------------------------------------------------------------------
--- DynASM x64 module.
---
--- Copyright (C) 2005-2015 Mike Pall. All rights reserved.
--- See dynasm.lua for full copyright notice.
-------------------------------------------------------------------------------
--- This module just sets 64 bit mode for the combined x86/x64 module.
--- All the interesting stuff is there.
-------------------------------------------------------------------------------
 
---unload dasm_x86 if it's already loaded.
+-- DynASM x64 loader module.
+
+--unload dasm_x86x64 if it's already loaded.
 if not package then package = {loaded = {}} end --for compat. with minilua
-local dasm_x86 = package.loaded.dasm_x86
-package.loaded.dasm_x86 = nil
-
-x64 = true -- Using a global is an ugly, but effective solution.
-local dasm_x64 = require("dasm_x86")
-
-package.loaded.dasm_x86 = dasm_x86 --put it back
-
-return dasm_x64
-
+package.loaded.dasm_x86x64 = nil
+dasm_x64 = true -- Using a global is an ugly, but effective solution.
+local dasm = require'dasm_x86x64'
+dasm_x64 = nil
+package.loaded.dasm_x86x64 = true
+return dasm