[llvm-commits] patch to make addCommonCodeGenPasses virtual

[Heikki Kultala]

Our backend(TCE) needs to add some custom passes in
addCommonCodeGenPasses, so we need our own version of that method in our
own TargetMachine implementation class.

However, as the addCommonCodeGenPasses was not virtual, it could not be called 
by the addPassesToEmitFile of LLVMTargetMachine, and we had to copy
the implementation of AddPassesToEmitFile to our TargetMachine class,
just to be able to call the correct addCommonCodeGenPasses class.

This patch just adds virtual keyword to definition of addCommonCodeGenPasses,
which allows us to get rid of extra redundant code in our backend, and should 
not harm anyone else in any way.
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