Make MoveOnlyWrapperToCopyableBoxInst a ConversionInstruction.

This appears to be an obvious oversight.

Author: atrick

SwiftCompilerSources/Sources/SIL/ForwardingInstruction.swift

@@ -265,6 +265,12 @@ extension MoveOnlyWrapperToCopyableValueInst : ConversionInstruction {
   public var canForwardOwnedValues: Bool { true }
 }
 
+extension MoveOnlyWrapperToCopyableBoxInst : ConversionInstruction {
+  public var preservesRepresentation: Bool { true }
+  public var canForwardGuaranteedValues: Bool { true }
+  public var canForwardOwnedValues: Bool { true }
+}
+
 extension UpcastInst : ConversionInstruction {
   public var preservesRepresentation: Bool { true }
   public var canForwardGuaranteedValues: Bool { true }
@@ -386,12 +392,6 @@ extension MarkUnresolvedReferenceBindingInst : ForwardingInstruction {
   public var canForwardOwnedValues: Bool { true }
 }
 
-extension MoveOnlyWrapperToCopyableBoxInst : ForwardingInstruction {
-  public var preservesRepresentation: Bool { true }
-  public var canForwardGuaranteedValues: Bool { true }
-  public var canForwardOwnedValues: Bool { true }
-}
-
 extension LinearFunctionExtractInst: ForwardingInstruction {
   public var preservesRepresentation: Bool { true }
   public var canForwardGuaranteedValues: Bool { true }