[runtime] Implement %_ToLength via ToLengthStub.

src/full-codegen/mips/full-codegen-mips.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 3793 matching lines @@
   // Load the argument into a0 and call the stub.
   VisitForAccumulatorValue(args->at(0));
   __ mov(a0, result_register());
 
   NumberToStringStub stub(isolate());
   __ CallStub(&stub);
   context()->Plug(v0);
 }
 
 
+void FullCodeGenerator::EmitToLength(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK_EQ(1, args->length());
+
+  // Load the argument into a0 and convert it.
+  VisitForAccumulatorValue(args->at(0));
+  __ mov(a0, result_register());
+
+  ToLengthStub stub(isolate());
+  __ CallStub(&stub);
+  context()->Plug(v0);
+}
+
+
 void FullCodeGenerator::EmitToString(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   DCHECK_EQ(1, args->length());
 
   // Load the argument into a0 and convert it.
   VisitForAccumulatorValue(args->at(0));
   __ mov(a0, result_register());
 
   ToStringStub stub(isolate());
   __ CallStub(&stub);
@@ skipping 1436 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS