[es6] Implement spec compliant ToPrimitive in the runtime.

src/full-codegen/arm/full-codegen-arm.cc

Index: src/full-codegen/arm/full-codegen-arm.cc
diff --git a/src/full-codegen/arm/full-codegen-arm.cc b/src/full-codegen/arm/full-codegen-arm.cc
index ef65b31c541f4b93ff5273a2f941e4580811f520..ca25d6ea554d94811cb7146501b7c5713a513a9c 100644
--- a/src/full-codegen/arm/full-codegen-arm.cc
+++ b/src/full-codegen/arm/full-codegen-arm.cc
@@ -3468,7 +3468,7 @@ void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
   // string "valueOf" the result is false.
   // The use of ip to store the valueOf string assumes that it is not otherwise
   // used in the loop below.
-  __ mov(ip, Operand(isolate()->factory()->value_of_string()));
+  __ LoadRoot(ip, Heap::kvalueOf_stringRootIndex);
   __ jmp(&entry);
   __ bind(&loop);
   __ ldr(r3, MemOperand(r4, 0));