Fast forward to sync public repo.

Compile math.sinh(), math.cosh(), math.tanh() and math.random().
Compile various io.*() functions.
Drive the GC forward on string allocations in the parser.
Improve KNUM fuse vs. load heuristics.
Add abstract C call handling to IR.

src/lj_opt_narrow.c

@@ -370,7 +370,7 @@ TRef lj_opt_narrow_mod(jit_State *J, TRef rb, TRef rc)
 TRef lj_opt_narrow_pow(jit_State *J, TRef rb, TRef rc, TValue *vc)
 {
   lua_Number n;
-  if (tvisstr(vc) && !lj_str_numconv(strVdata(vc), vc))
+  if (tvisstr(vc) && !lj_str_tonum(strV(vc), vc))
     lj_trace_err(J, LJ_TRERR_BADTYPE);
   n = numV(vc);
   /* Limit narrowing for pow to small exponents (or for two constants). */