disable closure when ASM_JS

emcc

@@ -856,6 +856,10 @@ try:
   if shared.Settings.CORRECT_SIGNS >= 2 or shared.Settings.CORRECT_OVERFLOWS >= 2 or shared.Settings.CORRECT_ROUNDINGS >= 2:
     keep_debug = True # must keep debug info to do line-by-line operations 
 
+  if closure and shared.Settings.ASM_JS:
+    print >> sys.stderr, 'emcc: warning: disabling closure because it is not compatible with asm.js code generation'
+    closure = False
+
   ## Compile source code to bitcode
 
   if DEBUG: print >> sys.stderr, 'emcc: compiling to bitcode'