[LLVMdev] Subtle breaking change in LLVM 2.7 to 2.8 transition

[Ben Karel]

I updated my from LLVM 2.7 to 2.8/trunk tonight and was mystified as to why
my GC plugin silently stopped working.

The problem was that the signature of the virtual function
GCMetadataPrinter::finishAssembly (and beginAssembly) changed.

This change would probably be an excellent candidate for the "gotchas"
section of the 2.8 release notes.

Thanks!
-- Ben
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