[Patch] Similar Function Merging

[Pranav Bhandarkar]

Hi,

The attached patch enhances the MergeFunctions pass to merge multiple 
similar (not necessarily identical) functions to achieve code-size 
benefit. The code implements what we presented at the LLVM developers 
meeting in Nov last year (http://llvm.org/devmtg/2013-11/#talk3 & 
http://llvm.org/devmtg/2013-11/slides/Koch-FunctionMerging.pdf)

Apologies for posting a large patch and for the delay in posting this.

regards,
Pranav

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