Optimize Float32x4Array and Int32x4Array element loading and storing for
ia32 and x64 port by:
  1). Allocating SIMD128 registers
  2). Emitting SIMD movups instruction
  3). Adding deoptimization support for SIMD128 registers or stack slots
Merge pull request #3 from fenghaitao/master

Optimize Float32x4Array and Int32x4Array element loading and storing