[NFC][Concurrency] Update validation tests for @MainActor(unsafe) changes.

Author: hborla

test/attr/attr_objc.swift

@@ -1878,7 +1878,7 @@ class HasIBOutlet {
 // CHECK-LABEL: {{^}}class HasIBAction {
 class HasIBAction {
   @IBAction func goodAction(_ sender: AnyObject?) { }
-  // CHECK: {{^}}  @objc @IBAction @MainActor func goodAction(_ sender: AnyObject?) {
+  // CHECK: {{^}}  @objc @IBAction @MainActor @preconcurrency func goodAction(_ sender: AnyObject?) {
 
   @IBAction func badAction(_ sender: PlainStruct?) { }
   // expected-error@-1{{method cannot be marked @IBAction because the type of the parameter cannot be represented in Objective-C}}

validation-test/ParseableInterface/unsafe-mainactor.swift

@@ -7,8 +7,8 @@
 
 import AppKit
 
-// CHECK: @objc @_inheritsConvenienceInitializers @_Concurrency.MainActor(unsafe) public class Subclass : AppKit.NSView {
+// CHECK: @objc @_inheritsConvenienceInitializers @_Concurrency.MainActor @preconcurrency public class Subclass : AppKit.NSView {
 public class Subclass: NSView {
-  // CHECK: @_Concurrency.MainActor(unsafe) @objc override dynamic public init(frame frameRect: Foundation.NSRect)
-  // CHECK: @_Concurrency.MainActor(unsafe) @objc required dynamic public init?(coder: Foundation.NSCoder)
+  // CHECK: @_Concurrency.MainActor @preconcurrency @objc override dynamic public init(frame frameRect: Foundation.NSRect)
+  // CHECK: @_Concurrency.MainActor @preconcurrency @objc required dynamic public init?(coder: Foundation.NSCoder)
 }

validation-test/Sema/SwiftUI/rdar76252310.swift

@@ -42,13 +42,13 @@ func fromConcurrencyAware() async {
   // expected-warning@+4 {{non-sendable type 'CoffeeTrackerView' passed in implicitly asynchronous call to main actor-isolated property 'body' cannot cross actor boundary}}
   // expected-note@+3 {{property access is 'async'}}
   // expected-warning@+2 {{non-sendable type 'some View' in implicitly asynchronous access to main actor-isolated property 'body' cannot cross actor boundary}}
-  // expected-error@+1 {{expression is 'async' but is not marked with 'await'}}
+  // expected-warning@+1 {{expression is 'async' but is not marked with 'await'}}
   _ = view.body
 
   // expected-warning@+4 {{non-sendable type 'CoffeeTrackerView' passed in implicitly asynchronous call to main actor-isolated property 'showDrinkList' cannot cross actor boundary}}
   // expected-note@+3 {{property access is 'async'}}
   // expected-warning@+2 {{non-sendable type 'Visibility' in implicitly asynchronous access to main actor-isolated property 'showDrinkList' cannot cross actor boundary}}
-  // expected-error@+1 {{expression is 'async' but is not marked with 'await'}}
+  // expected-warning@+1 {{expression is 'async' but is not marked with 'await'}}
   _ = view.showDrinkList
 
   // expected-warning@+2 {{non-sendable type 'CoffeeTrackerView' passed in implicitly asynchronous call to main actor-isolated property 'storage' cannot cross actor boundary}}