Added parentheses in TimeAmount constructors to generate optimal code. As Per issue #1249 (#1250)
Added parentheses in TimeAmount constructors to generate optimal code. As Per issue #1249 (#1250)

Motivation:

For better codegen for TimeAmount struct.
After this change overflow will not be checked at each multiplication stage.

Modifications:

- Added parentheses in static constructors of `TimeAmount`

Result:

No change logically except better codegen
apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio,apple/swift-nio