breaking: fix @sizeOf to be alloc size rather than store size

* Fixes breaches of the guarantee that `@sizeOf(T) >= @alignOf(T)`
 * Fixes std.mem.secureZero for integers where this guarantee previously
   was breached
 * Fixes std.mem.Allocator for integers where this guarantee previously
   was breached

Closes #1851
Closes #1864
7293e012d7Andrew Kelley committed on 2/15/2019, 11:05:50 PMparent567c9b6
8 files changedLine totals unavailable