[runtime] Port simple String.prototype.indexOf cases to TF Builtin

src/compiler/code-assembler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 967 matching lines @@
 }
 
 Node* CodeAssembler::CallCFunction2(MachineType return_type,
                                     MachineType arg0_type,
                                     MachineType arg1_type, Node* function,
                                     Node* arg0, Node* arg1) {
   return raw_assembler()->CallCFunction2(return_type, arg0_type, arg1_type,
                                          function, arg0, arg1);
 }
 
+Node* CodeAssembler::CallCFunction3(MachineType return_type,
+                                    MachineType arg0_type,
+                                    MachineType arg1_type,
+                                    MachineType arg2_type, Node* function,
+                                    Node* arg0, Node* arg1, Node* arg2) {
+  return raw_assembler()->CallCFunction3(return_type, arg0_type, arg1_type,
+                                         arg2_type, function, arg0, arg1, arg2);
+}
+
 void CodeAssembler::Goto(Label* label) {
   label->MergeVariables();
   raw_assembler()->Goto(label->label_);
 }
 
 void CodeAssembler::GotoIf(Node* condition, Label* true_label) {
   Label false_label(this);
   Branch(condition, true_label, &false_label);
   Bind(&false_label);
 }
@@ skipping 152 matching lines @@
             variable_phis_[var] = nullptr;
           }
         }
       }
     }
   }
 
   for (auto var : variable_phis_) {
     CodeAssemblerVariable::Impl* var_impl = var.first;
     auto i = variable_merges_.find(var_impl);
-    // If the following assert fires, then a variable that has been marked as
+    // If the following asserts fire, then a variable that has been marked as
     // being merged at the label--either by explicitly marking it so in the
     // label constructor or by having seen different bound values at branches
     // into the label--doesn't have a bound value along all of the paths that
     // have been merged into the label up to this point.
-    DCHECK(i != variable_merges_.end() && i->second.size() == merge_count_);
+    DCHECK(i != variable_merges_.end());
+    DCHECK_EQ(i->second.size(), merge_count_);
     Node* phi = state_->raw_assembler_->Phi(
         var.first->rep_, static_cast<int>(merge_count_), &(i->second[0]));
     variable_phis_[var_impl] = phi;
   }
 
   // Bind all variables to a merge phi, the common value along all paths or
   // null.
   for (auto var : state_->variables_) {
     auto i = variable_phis_.find(var);
     if (i != variable_phis_.end()) {
       var->value_ = i->second;
     } else {
       auto j = variable_merges_.find(var);
       if (j != variable_merges_.end() && j->second.size() == merge_count_) {
         var->value_ = j->second.back();
       } else {
         var->value_ = nullptr;
       }
     }
   }
 
   bound_ = true;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8