[LLVMbugs] [PATCH] fix llvm::Interval name clash

[Vladimir Prus]

It turns out that there are two classes named llvm::Interval. The first is in 
llvm/Analysis/Interval.h and the second is in lib/CodeGen/LiveIntervals.h.

I'm not sure why it works with make-based build system, but I've just build 
llc with Boost.Build, and this name clash result in run-time failure -- since 
for shared libraries the linker will pick one of the symbols in case of name 
clash, and this time it's the wrong symbol.

That attached patch renamed the latter Interval to LiveInterval. The other 
possibility was to use anonymous namespace, but I prefered to make the 
simplest possible change.

- Volodya
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