[PATCH] [SLPVectorization] Vectorize Reduction Chain feeding into a 'return' statement

[suyog]

Hi aschwaighofer, nadav, jmolloy, rengolin, hfinkel,

This patch vectorizes a reduction chain feeding into a 'return' statement.

(The reduction chain though, with current code, has to be in specific form - for return/store/others. 
Improvements in it to follow in separate patches).

I do have one question - Should this be moved under a special 'flag' (same as horizontal store)?

Please help in reviewing the patch.

Regards,
Suyog

http://reviews.llvm.org/D6227

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/X86/return.ll
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