[turbofan] JSCreateClosure doesn't have any JS observable side effects.

src/compiler/js-operator.cc

Index: src/compiler/js-operator.cc
diff --git a/src/compiler/js-operator.cc b/src/compiler/js-operator.cc
index eafa8b4601185245b29e58fbfb7ec185a9a9cea8..70917c1acf605dd4252ea6de6cc9d3500379e802 100644
--- a/src/compiler/js-operator.cc
+++ b/src/compiler/js-operator.cc
@@ -1064,11 +1064,11 @@ const Operator* JSOperatorBuilder::CreateClosure(
     Handle<SharedFunctionInfo> shared_info, VectorSlotPair const& feedback,
     PretenureFlag pretenure) {
   CreateClosureParameters parameters(shared_info, feedback, pretenure);
-  return new (zone()) Operator1<CreateClosureParameters>(  // --
-      IrOpcode::kJSCreateClosure, Operator::kNoThrow,      // opcode
-      "JSCreateClosure",                                   // name
-      0, 1, 1, 1, 1, 0,                                    // counts
-      parameters);                                         // parameter
+  return new (zone()) Operator1<CreateClosureParameters>(   // --
+      IrOpcode::kJSCreateClosure, Operator::kEliminatable,  // opcode
+      "JSCreateClosure",                                    // name
+      0, 1, 1, 1, 1, 0,                                     // counts
+      parameters);                                          // parameter
 }
 
 const Operator* JSOperatorBuilder::CreateLiteralArray(