Merge pull request swiftlang#28953 from compnerd/imvu

SIL: explicitly instantiate the `Operand` move ctor

Author: compnerd

include/swift/SIL/SILValue.h

@@ -586,6 +586,9 @@ class Operand {
   Operand(const Operand &use) = delete;
   Operand &operator=(const Operand &use) = delete;
 
+  Operand(Operand &&) = default;
+  Operand &operator=(Operand &&) = default;
+
   /// Return the current value being used by this operand.
   SILValue get() const { return TheValue; }