[turbofan] Introduce LoadFunctionPrototype simplified operator.

src/compiler/simplified-operator.cc

Index: src/compiler/simplified-operator.cc
diff --git a/src/compiler/simplified-operator.cc b/src/compiler/simplified-operator.cc
index 345a2c5f88177cf2713b22f1e958b34ec8d99519..f0cdd8030db96f35643c6f4544e8f56001386bcc 100644
--- a/src/compiler/simplified-operator.cc
+++ b/src/compiler/simplified-operator.cc
@@ -495,6 +495,13 @@ struct SimplifiedOperatorGlobalCache final {
   };
   ArrayBufferWasNeuteredOperator kArrayBufferWasNeutered;
 
+  struct LoadFunctionPrototypeOperator final : public Operator {
+    LoadFunctionPrototypeOperator()
+        : Operator(IrOpcode::kLoadFunctionPrototype, Operator::kEliminatable,
+                   "LoadFunctionPrototype", 1, 1, 1, 1, 1, 0) {}
+  };
+  LoadFunctionPrototypeOperator kLoadFunctionPrototype;
+
   template <CheckForMinusZeroMode kMode>
   struct CheckedInt32MulOperator final
       : public Operator1<CheckForMinusZeroMode> {
@@ -639,6 +646,7 @@ SimplifiedOperatorBuilder::SimplifiedOperatorBuilder(Zone* zone)
 PURE_OP_LIST(GET_FROM_CACHE)
 CHECKED_OP_LIST(GET_FROM_CACHE)
 GET_FROM_CACHE(ArrayBufferWasNeutered)
+GET_FROM_CACHE(LoadFunctionPrototype)
 #undef GET_FROM_CACHE
 
 const Operator* SimplifiedOperatorBuilder::CheckedInt32Mul(