[llvm-commits] FoldingSet of string with NULLs inside

[Nick Lewycky]

I noticed that FoldingSet has two copies of the same code for AddString. 
I took a stab at refactoring them into one shared function that just 
takes two char*'s. This has the added benefit of allowing strings that 
have NULLs in the middle.

I'm not familiar with this code so I thought I'd send it out for review 
first.

Nick Lewycky
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