Request for reviews (L): 6761600: Use SSE 4.2 In STTNI Intrinsics

[Changpeng Fang]

http://webrev.invokedynamic.info/cfang/6761600/index.html

Works on 6761600 : Use SSE 4.2 in intrinsics for String.compareTo(),
String.equals(), String.indexOf() and Arrays.equals(), among which,
String.equals() and String.indexOf() are intrinsified for the first time.

Problem: Use SSE 4.2 instructions for STTNI intrinsics for for Nehalem
               improvements

Solution:
    Implemented both 32 and 64-bit versions for X86.  Introduced  a new
flag  UseSSE42Intrinsics, with the default TRUE on systems that support
SSE4.2 (false otherwise).

 Reviewed by:
 
 Fix verified (y/n): y

 Other testing:  JPRT,