Bug 21535 – dtoh: Insufficient size_t/ptrdiff_t detection

In root/bitarray.d: struct BitArray { alias Chunk_t = size_t; enum ChunkSize = Chunk_t.sizeof; enum BitsPerChunk = ChunkSize * 8; size_t len; size_t *ptr; } In frontend.h: struct BitArray { typedef uint64_t Chunk_t; enum : uint64_t { ChunkSize = 8LLU }; enum : uint64_t { BitsPerChunk = 64LLU }; size_t len; uint64_t* ptr; } `Chunk_t` and `ptr` probably can and should be fixed; not sure about the 2 size-related enums.

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