Promote LifetimeDependenceMutableAccessors and InoutLifetimeDependence to language features

These were added to guard specific source code in swift interface files for older compilers.
They do not guard any experimental language feature specifically.
Turn them on by default to prevent unnecessary flags developers need to add in their configs.

Author: meg-gupta

include/swift/Basic/Features.def

@@ -273,6 +273,8 @@ LANGUAGE_FEATURE(NonescapableAccessorOnTrivial, 0, "Support UnsafeMutablePointer
 BASELINE_LANGUAGE_FEATURE(LayoutPrespecialization, 0, "Layout pre-specialization")
 BASELINE_LANGUAGE_FEATURE(IsolatedDeinit, 371, "isolated deinit")
 LANGUAGE_FEATURE(InlineArrayTypeSugar, 483, "Type sugar for InlineArray")
+LANGUAGE_FEATURE(LifetimeDependenceMutableAccessors, 0, "Support mutable accessors returning ~Escapable results")
+LANGUAGE_FEATURE(InoutLifetimeDependence, 0, "Support @_lifetime(&)")
 
 // Swift 6
 UPCOMING_FEATURE(ConciseMagicFile, 274, 6)
@@ -435,10 +437,6 @@ EXPERIMENTAL_FEATURE(StructLetDestructuring, true)
 /// Enable returning non-escapable types from functions.
 EXPERIMENTAL_FEATURE(LifetimeDependence, true)
 
-/// Enable inout lifetime dependence - @lifetime(&arg)
-EXPERIMENTAL_FEATURE(InoutLifetimeDependence, true)
-EXPERIMENTAL_FEATURE(LifetimeDependenceMutableAccessors, true)
-
 /// Enable the `@_staticExclusiveOnly` attribute.
 EXPERIMENTAL_FEATURE(StaticExclusiveOnly, true)