[PATCH] [C++11] Change DebugInfoFinder to use range-based loops

[Alon Mishne]

This patch changes DebugInfoFinder iterator functions to be
range-based-loops-friendly. To make it even easier to users the iterators
now also actually return the DI type, not just the MDNode - all but one
user (in DebugIR) benefit from this.

Notice that this means there are now 5 iterator typedefs instead of just
one; but in the rare case they need to be referred to, such as in
Cloning.cpp, "auto" can just be used. Also, once all supported compilers
implement alias template, all 5 typedefs could be generalized into one.

- Alon
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