New autoload and math test cases. Currently autoload does not work because

the GETGLOBAL instruction does not handle the case where a metatable method
is invoked.

src/test/res/autoload.lua

@@ -0,0 +1,11 @@
+local function autoload(table, key)
+	local chunk = loadfile("/"..key..".luac")
+	table[key] = chunk()
+end
+
+autoload_mt = { __index = autoload }
+
+setmetatable(_G, autoload_mt)
+
+print("square root of 9.0 is ", math.sqrt(9.0))
+print("math.pi=", math.pi);