[Issue 20980] std.bigint.BigInt: special case x & non-negative int to avoid unnecessary allocation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20980

Nathan S. <n8sh.secondary at hotmail.com> changed:

           What    |Removed                     |Added
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            Summary|std.bigint.BigInt: special  |std.bigint.BigInt: special
                   |case x & 1 to avoid         |case x & non-negative int
                   |unnecessary allocation      |to avoid unnecessary
                   |                            |allocation

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