[Issue 10661] Add secureZeroMemory function in Phobos

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=10661

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
volatileMemset() should call the C memset_s() function, if that function
exists.

Also, there should be a zeroRegisters() function that zeros out all the scratch
registers.

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