[Concurrency] Clock.measure should inherit actor isolation.

Author: hborla

stdlib/public/Concurrency/Clock.swift

@@ -67,7 +67,18 @@ extension Clock {
   ///          await someWork()
   ///       }
   @available(SwiftStdlib 5.7, *)
+  @_alwaysEmitIntoClient
   public func measure(
+    isolation: isolated (any Actor)? = #isolation,
+    _ work: () async throws -> Void
+  ) async rethrows -> Instant.Duration {
+    try await measure(work)
+  }
+
+  @available(SwiftStdlib 5.7, *)
+  @_unsafeInheritExecutor
+  @usableFromInline
+  internal func measure(
     _ work: () async throws -> Void
   ) async rethrows -> Instant.Duration {
     let start = now

test/Concurrency/Runtime/clock.swift

@@ -1,3 +1,4 @@
+// RUN: %target-typecheck-verify-swift -strict-concurrency=complete -disable-availability-checking -parse-as-library
 // RUN: %target-run-simple-swift( -Xfrontend -disable-availability-checking -parse-as-library)
 
 // REQUIRES: concurrency
@@ -12,7 +13,7 @@
 import _Concurrency
 import StdlibUnittest
 
-var tests = TestSuite("Time")
+@MainActor var tests = TestSuite("Time")
 
 @main struct Main {
   static func main() async {