OP_NEWTABLE keeps exact size of arrays

OP_NEWTABLE is followed by an OP_EXTRAARG, so that it can keep
the exact size of the array part of the table to be created.
(Functions 'luaO_int2fb'/'luaO_fb2int' were removed.)

lobject.c

@@ -29,32 +29,6 @@
 #include "lvm.h"
 
 
-/*
-** converts an integer to a "floating point byte", represented as
-** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
-** eeeee != 0 and (xxx) otherwise.
-*/
-int luaO_int2fb (unsigned int x) {
-  int e = 0;  /* exponent */
-  if (x < 8) return x;
-  while (x >= (8 << 4)) {  /* coarse steps */
-    x = (x + 0xf) >> 4;  /* x = ceil(x / 16) */
-    e += 4;
-  }
-  while (x >= (8 << 1)) {  /* fine steps */
-    x = (x + 1) >> 1;  /* x = ceil(x / 2) */
-    e++;
-  }
-  return ((e+1) << 3) | (cast_int(x) - 8);
-}
-
-
-/* converts back */
-int luaO_fb2int (int x) {
-  return (x < 8) ? x : ((x & 7) + 8) << ((x >> 3) - 1);
-}
-
-
 /*
 ** Computes ceil(log2(x))
 */