[stubs] Split ToNumberStub into reusable subparts.

test/cctest/compiler/test-js-typed-lowering.cc

 // Copyright 2014 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/compilation-dependencies.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/opcodes.h"
@@ skipping 957 matching lines @@
 
   const Operator* ops[] = {
       R.javascript.GreaterThan(), R.simplified.NumberLessThan(),
       R.javascript.GreaterThanOrEqual(), R.simplified.NumberLessThanOrEqual(),
   };
 
   for (size_t j = 0; j < arraysize(ops); j += 2) {
     BinopEffectsTester B(ops[j], Type::Symbol(), Type::String());
     CHECK_EQ(ops[j + 1]->opcode(), B.result->op()->opcode());
 
-    Node* i0 = B.CheckConvertedInput(IrOpcode::kJSToNumber, 0, true);
+    Node* i0 = B.CheckConvertedInput(IrOpcode::kStringToNumber, 0, false);
     Node* i1 = B.CheckConvertedInput(IrOpcode::kJSToNumber, 1, true);
 
     // Inputs should be commuted.
     CHECK_EQ(B.p1, i0->InputAt(0));
     CHECK_EQ(B.p0, i1->InputAt(0));
 
     // But effects should be ordered start -> i1 -> effect_use
     B.CheckEffectOrdering(i1);
   }
 
@@ skipping 229 matching lines @@
           CHECK_EQ(p1, r->InputAt(1));
         }
       }
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8