Merge pull request #37183 from gottesmm/pr-7ec13868d15cea60ec4eafdbdb099efffff74f9a

[sil-optimizer] Add LLVM_ATTRIBUTE_UNUSED to InstModCallback::on* methods

Author: gottesmm

include/swift/SILOptimizer/Utils/InstOptUtils.h

@@ -104,23 +104,24 @@ class InstModCallbacks {
   InstModCallbacks(const InstModCallbacks &) = default;
 
   /// Return a copy of self with deleteInstFunc set to \p newDeleteInstFunc.
-  InstModCallbacks onDelete(decltype(deleteInstFunc) newDeleteInstFunc) const {
+  LLVM_ATTRIBUTE_UNUSED InstModCallbacks
+  onDelete(decltype(deleteInstFunc) newDeleteInstFunc) const {
     InstModCallbacks result = *this;
     result.deleteInstFunc = newDeleteInstFunc;
     return result;
   }
 
   /// Return a copy of self with createdNewInstFunc set to \p
   /// newCreatedNewInstFunc.
-  InstModCallbacks
+  LLVM_ATTRIBUTE_UNUSED InstModCallbacks
   onCreateNewInst(decltype(createdNewInstFunc) newCreatedNewInstFunc) const {
     InstModCallbacks result = *this;
     result.createdNewInstFunc = newCreatedNewInstFunc;
     return result;
   }
 
   /// Return a copy of self with setUseValueFunc set to \p newSetUseValueFunc.
-  InstModCallbacks
+  LLVM_ATTRIBUTE_UNUSED InstModCallbacks
   onSetUseValue(decltype(setUseValueFunc) newSetUseValueFunc) const {
     InstModCallbacks result = *this;
     result.setUseValueFunc = newSetUseValueFunc;
@@ -129,6 +130,7 @@ class InstModCallbacks {
 
   /// Return a copy of self with notifyWillBeDeletedFunc set to \p
   /// newNotifyWillBeDeletedFunc.
+  LLVM_ATTRIBUTE_UNUSED
   InstModCallbacks onNotifyWillBeDeleted(
       decltype(notifyWillBeDeletedFunc) newNotifyWillBeDeletedFunc) const {
     InstModCallbacks result = *this;