[embedded] Ifdef newly added _assertionFailure + isKnownUniquelyReferenced variants to avoid exposing new APIs outside of embedded Swift

Author: kubamracek

stdlib/public/core/AssertCommon.swift

@@ -175,6 +175,7 @@ internal func _assertionFailure(
   Builtin.int_trap()
 }
 
+#if $Embedded
 @usableFromInline
 @inline(never)
 @_semantics("programtermination_point")
@@ -184,6 +185,7 @@ internal func _assertionFailure(
 ) -> Never {
   Builtin.int_trap()
 }
+#endif
 
 /// This function should be used only in the implementation of stdlib
 /// assertions.

stdlib/public/core/ManagedBuffer.swift

@@ -564,11 +564,13 @@ public func isKnownUniquelyReferenced<T: AnyObject>(_ object: inout T) -> Bool
   return _isUnique(&object)
 }
 
+#if $Embedded
 @inlinable
 public func isKnownUniquelyReferenced(_ object: inout Builtin.NativeObject) -> Bool
 {
   return _isUnique(&object)
 }
+#endif
 
 /// Returns a Boolean value indicating whether the given object is known to
 /// have a single strong reference.