Fix typo.

  J is actually PC relative long branch in TILE-Gx, currently we don't
have absolute relocation for TILE-Gx.
Instruction bundle support for math.abs and part of string lib under DUALNUM mode.
Instruction bundle for all bit lib under DUALNUM mode.
Instruction bundle for all left DUALNUM mode instruction templates.
Optimize memory load latency.

  currently, SCI benchmark result is:

Benchmark   LuaJIT  Lua     Ratio
FFT         2.18    1.97    +10.65%
SOR         5.25    4.39    +19.59%
MC          1.24    1.37    -9.49%
SPARSE      2.78    3.09    -10.03%
LU          4.12    3.23    +27.55%

Overall     3.11    2.81    +10.68%
Optimize load latency for several other hot hooks.

  just a few gain.