Cursor info on `type(of:)` fails unless cursor is at the start of `type`

The following new test case fails. It passes when changing the column to 3. I suppose that something in the logic to adjust to the start of an identifier fails.

```swift
func test(x: String) {
  // RUN: %sourcekitd-test -req=cursor -pos=%(line + 1):4 %s -- %s | %FileCheck %s
  type(of: x)
  // CHECK: type(of:)
}
```