swift-format can't treat `unsafe` expressions correctly

[kkebo]

Summary

In SE-0458, the new unsafe expression has been added. However, swift-format still can't handle it correctly.

Prerequisites

• swift-format main branch 88a8900
• swift-syntax main branch 94681bad0aa2ef3a277d2895e7f0c9e60ec2bbb1

Steps to reproduce

1. Create test.swift

   _ = unsafe UnsafeRawPointer(bitPattern: 0)

2. Run swift-format format test.swift

Expected output

_ = unsafe UnsafeRawPointer(bitPattern: 0)

Actual output

It breaks the source code.

_ = unsafeUnsafeRawPointer(bitPattern: 0)

[ahoppen]

Synced to Apple’s issue tracker as rdar://148183841

[allevato]

I'm prepping a PR for this.