Concurrency: Make _Concurrency module interface parsable by older compilers.

Revert a few unnecessary changes have been made to the _Concurrency module
recently that make its swiftinterface un-parseable by older compilers that we
need to support.

- The `consume` keyword is not understood by older compilers, so including it
  in inlinable code is a problem. It has no actual effect on lifetimes where it
  was used, so just omit it.
- Don't build the _Concurrency module with -enable-experimental-feature
  MoveOnly. The MoveOnly feature is now enabled by default in recent compilers,
  so the flag is superfluous when building the dylib. When emitting the
  interface, having the feature enabled explicitly exposes code guarded by
  `$MoveOnly` to older compilers that do not accept all of the code.

Resolves rdar://108793606

Author: tshortli

stdlib/public/BackDeployConcurrency/TaskLocal.swift

@@ -172,7 +172,7 @@ public final class TaskLocal<Value: Sendable>: Sendable, CustomStringConvertible
     // check if we're not trying to bind a value from an illegal context; this may crash
     _checkIllegalTaskLocalBindingWithinWithTaskGroup(file: file, line: line)
 
-    _taskLocalValuePush(key: key, value: consume valueDuringOperation)
+    _taskLocalValuePush(key: key, value: valueDuringOperation)
     defer { _taskLocalValuePop() }
 
     return try await operation()

stdlib/public/Concurrency/CMakeLists.txt

@@ -149,7 +149,6 @@ add_swift_target_library(swift_Concurrency ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} I
     ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
     -parse-stdlib
     -Xfrontend -enable-experimental-concurrency
-    -enable-experimental-feature MoveOnly
     -diagnostic-style swift
     ${SWIFT_RUNTIME_CONCURRENCY_SWIFT_FLAGS}
   ${swift_concurrency_options}

stdlib/public/Concurrency/TaskLocal.swift

@@ -172,7 +172,7 @@ public final class TaskLocal<Value: Sendable>: Sendable, CustomStringConvertible
     // check if we're not trying to bind a value from an illegal context; this may crash
     _checkIllegalTaskLocalBindingWithinWithTaskGroup(file: file, line: line)
 
-    _taskLocalValuePush(key: key, value: consume valueDuringOperation)
+    _taskLocalValuePush(key: key, value: valueDuringOperation)
     defer { _taskLocalValuePop() }
 
     return try await operation()