[Issue 14114] DMD optimizer defeats use of volatileLoad/Store with error: null dereference in function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=14114

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
Decided the best fix was to allow volatile read/writes, as some systems do
store things at null.

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