Fix metatable processing on luaGetTable

src/test/res/simplemetatables.lua

@@ -0,0 +1,14 @@
+-- The purpose of this test case is to check
+-- that certain simple metatable operations work properly
+t = { b='bbb' }
+t.__index = t
+u = {}
+setmetatable( u, t )
+u.c = 'ccc'
+
+print( 't.a', t.a )
+print( 'u.a', u.a )
+print( 't.b', t.b )
+print( 'u.b', u.b )
+print( 't.c', t.c )
+print( 'u.c', u.c )