Wrong diagnostic with `async throws` property

[NachoSoto]

To Reproduce

struct A {
    var p: Int {
        async get throws { return 0 }
    }
}

Expected behavior

• Fix-it to replace async get throws with get async throws

Actual behavior

error: repl.swift:3:9: error: found 'async' in expression; did you mean 'await'?
        async get throws {
        ^~~~~
        await

error: repl.swift:3:19: error: 'throws' may only occur before '->'
        async get throws {
                  ^

Environment

• OS: macOS 13.0 beta 1
• Swift version: 5.7 (swiftlang-5.7.0.113.202 clang-1400.0.16.2)

[NachoSoto]

@etcwilde FYI this is still broken on Swift 6.