[Issue 18730] dmd miscompiles core.bitop.bt with -O

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18730

ag0aep6g <ag0aep6g at gmail.com> changed:

           What    |Removed                     |Added
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             Blocks|                            |18750


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=18750
[Issue 18750] [Tracker] everything wrong with code generation for bt
instruction
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