Break out overflow-calculations into semantically-named inlines

Adding days to seconds or millis, or seconds to millis, involves
scaling one and adding the other, so has to check for overflow. The
std::integral_constant boilerplate and the complications of calling
mul_overflow() and add_overflow() rather hid what was going on, so
package them in inlines so that their calls are more intelligible.

Change-Id: I1e90de8fcb81eb84920868c7e4bd217ee353fc54
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

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