Add cross-32/64 bit and deterministic bytecode generation.

Contributed by Peter Cawley. #993 #1008

src/lj_lex.h

@@ -74,6 +74,7 @@ typedef struct LexState {
   MSize sizebcstack;	/* Size of bytecode stack. */
   uint32_t level;	/* Syntactical nesting level. */
   int endmark;		/* Trust bytecode end marker, even if not at EOF. */
+  int fr2;		/* Generate bytecode for LJ_FR2 mode. */
 } LexState;
 
 LJ_FUNC int lj_lex_setup(lua_State *L, LexState *ls);