Bug 20813 – std.experimental.allocator add fault injecting allocator

A feature request of adding an allocator building block that with a given probability simply fails to allocate memory and returns null. Otherwise allocate from the parent. Determination can be done using per-thread random generator for example. Extra conditions (i.e. do different probabilities for different sizes) can be done using other allocator building blocks. As a bonus it might be useful in some cases to fail multiple consecutive calls to allocate(), not just do it every 1000 calls. I.e. fail 3 calls to allocate().

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