Debugger: Use the code model to detect unitialized variables.
This should save debugger round trips and crashes in the debugging helpers. Add respective option to debugging helper option page, defaulting to true.On this occasion, make CDB detect shadowed variables correctly and display them as "<shadowed n>" as does the Gdb engine by reversing the direction in which CdbSymbolGroupContext::populateINameIndexMap works. Rubber-stamped-by: hjk <firstname.lastname@example.org>
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