[Distributed] fix typo in CHECK assertions (swiftlang#81795)

... in distributed_actor_accessor_thunks_32bit.swift

Spotted a typo while skimming through the test so let's fix it. it
should be CHECK-SAME and not CHECK_SAME which would just do nothing

Author: ktoso

test/Distributed/distributed_actor_accessor_thunks_32bit.swift

@@ -245,7 +245,7 @@ public distributed actor MyOtherActor {
 // CHECK-SAME: %swift.context* [[THUNK_CONTEXT_PTR]],
 // CHECK-SAME: i32 [[STR_ARG_SIZE]],
 // CHECK-SAME: i32 [[STR_ARG_VAL]],
-// CHECK_SAME: i32 [[STR_ARG_FLAGS]],
+// CHECK-SAME: i32 [[STR_ARG_FLAGS]],
 // CHECK-SAME: %T27distributed_actor_accessors7MyActorC* [[ACTOR]])
 
 // CHECK-NEXT: [[TASK_REF:%.*]] = extractvalue { i8*, i32, %swift.error* } [[THUNK_RESULT]], 0