Minor fixes

Author: DougGregor

stdlib/public/Concurrency/Actor.cpp

@@ -246,7 +246,7 @@ static _CFThreadRef __initialPthread = INVALID_HANDLE_VALUE;
 static bool isExecutingOnMainThread() {
 #if defined(__linux__)
   return syscall(SYS_gettid) == getpid();
-#elseif defined(_WIN32)
+#elif defined(_WIN32)
   if (__initialPthread == INVALID_HANDLE_VALUE) {
     DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
                     GetCurrentProcess(), &__initialPthread, 0, FALSE,

test/Concurrency/Runtime/data_race_detection.swift

@@ -57,14 +57,14 @@ actor MyActor {
 struct Runner {
   @MainActor static func main() async {
     print("Launching a main-actor task")
-    // CHECK: warning: data race detected: @MainActor function at main/data_race_detection.swift:15 was not called on the main thread
+    // CHECK: warning: data race detected: @MainActor function at main/data_race_detection.swift:21 was not called on the main thread
     launchFromMainThread()
     sleep(1)
 
     let actor = MyActor()
     let actorFn = await actor.getTaskOnMyActor()
     print("Launching an actor-instance task")
-    // CHECK: warning: data race detected: actor-isolated function at main/data_race_detection.swift:44 was not called on the same actor
+    // CHECK: warning: data race detected: actor-isolated function at main/data_race_detection.swift:50 was not called on the same actor
     launchTask(actorFn)
 
     sleep(1)