[SR-12395] Fixit uses different generic type spelling than the protocol requirement

[swift-ci]

Previous ID	SR-12395
Radar	rdar://problem/60832868
Original Reporter	cukier (JIRA User)
Type	Bug

Environment

Xcode Version 11.4 beta 3 (11N132i)

Additional Detail from JIRA

Votes	0
Component/s
Labels	Bug
Assignee	None
Priority	Medium

md5: b589a50929b998bd5fc09f8ee2142706

Issue Description:

if you have

typealias Zzz = FloatingPoint
protocol Proto {
    func hello<T: Zzz>() -> T
}

struct Foo: Proto {
}

and use a fixit to add protocol stubs, you get

    func hello<T>() -> T where T : FloatingPoint {
        <#code#>
    }

which doesn't use the shorthand type constraint syntax, and doesn't use the typealias.
I would've expected fixit to insert the following text:

    func hello<T: Zzz>() -> T {
        <#code#>
    }

[beccadax]

@swift-ci create