stdlib: SE-0101: remove old syntax

[gribozavr]

This finishes the implementation of SE-0101.

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[gribozavr]

@swift-ci Please test

[rintaro]

/Users/buildnode/jenkins/workspace/swift-PR-osx/swift/validation-test/stdlib/CoreAudio.swift:233:29: error: 'sizeof' is unavailable: use MemoryLayout<T>.size instead.
    capacity: sizeInBytes / sizeof(AudioBufferList.self))
                            ^~~~~~
Swift.sizeof:2:13: note: 'sizeof' has been explicitly marked unavailable here
public func sizeof<T>(_: T.Type) -> Int
            ^

Oops, sorry about that.

[gribozavr]

@rintaro No problem, thank you for doing the implementation!

@swift-ci Please test