comment on running .bc files

tools/exec_llvm.py

@@ -24,6 +24,13 @@ running
 it runs
 
   python $(EMSCRIPTEN_TOOLS)/exec_llvm.py THE_FILE PARAMS
+
+An alternative solution to this problem is to compile
+the .ll into native code. This can be done as follows:
+
+ * Use llc to generate x86 asm
+ * Use as to generate an object file
+ * Use g++ to link it to an executable
 '''
 
 import os, sys