Introduce Float32x4, Int32x4, Float32x4Array and Int32x4Array data
types, implement the SIMD operations on the Float32x4 and Int32x4 with
C++ runtime functions and implement Float32x4Array and Int32x4Array
element loading and storing.
Merge pull request #1 from fenghaitao/master

Implement SIMD APIs with C++ runtime functions and Float32x4Array and Int32x4Array element load and store for IA32 port