Both new files initialize a global with 'Int(17.0 / 3.5)', which the SIL folder only folds against an optimized stdlib. `IntegerExpressions.swift` and `IntegerExpressionsSyntactic.swift` use the same expression behind the same requirement. Without it, the stdlib-DebugAssert bots report a spurious "'@const' value should be initialized with a compile-time value".