[PATCH] Adding ASAN support for libc++'s vector

[Marshall Clow]

Address sanitizer does not currently check for accesses beyond the end of a vector, but within the memory block managed by the vector.

For example:
	vector<int> v;
        v.reserve(10); // make space for 10 elements, but vector is still empty
        cout << v[1]; // access outside the “valid elements” of the vector.

This patch adds the ability to detect these kinds of errors to libc++ when using Address Sanitizer.
Thanks to Kostya for most of the code here.

— Marshall



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