[X86][LLVM]Expanding Supports lowerInterleavedStore() in X86InterleavedAccess part1.

splitting patch D34601 into two part. This part changes the location of two functions. 
The second part will be based on that patch. This was requested by @RKSimon.

Reviewers:
1. dorit	
2. Farhana	
3. RKSimon	
4. guyblank	
5. DavidKreitzer

llvm-svn: 309084