Bug 23231 – splitWhen from std.algorithm is not CTFEable

The following example should compile: ``` import std.algorithm.comparison : equal; import std.range : dropExactly; immutable source = [4, 3, 2, 11, 0, -3, -3, 5, 3, 0]; enum result1 = source.splitWhen!((a,b) => a <= b); ``` It doesn't because ChunkBy implementation is used for splitWhen and swapping refcounter playloads are not supported due to a "fakePureCalloc" call.

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