[LLVMbugs] Incorrect return types for Statistic operators

[Chris Lattner]

> The lvalue-returning Statistic<> operators (e.g., ++, =, +=, -=) should
> return a reference to *this, not a reference to the contained Data value.

Good point.  They should return const references, to disallow bizarre
things like:  (A += B) = C;

http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20021028/001167.html

Thanks again for the patch!

-Chris

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