Give the binary op stubs better names to make profiles more informative.

src/arm/codegen-arm.cc

Index: src/arm/codegen-arm.cc
===================================================================
--- src/arm/codegen-arm.cc	(revision 3439)
+++ src/arm/codegen-arm.cc	(working copy)
@@ -5680,6 +5680,29 @@
 }
 
 
+const char* GenericBinaryOpStub::GetName() {
+  if (name_ != NULL) return name_;
+  const int len = 100;
+  name_ = Bootstrapper::AllocateAutoDeletedArray(len);
+  if (name_ == NULL) return "OOM";
+  const char* op_name = Token::Name(op_);
+  const char* overwrite_name;
+  switch (mode_) {
+    case NO_OVERWRITE: overwrite_name = "Alloc"; break;
+    case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break;
+    case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break;
+    default: overwrite_name = "UnknownOverwrite"; break;
+  }
+
+  OS::SNPrintF(Vector<char>(name_, len),
+               "GenericBinaryOpStub_%s_%s%s",
+               op_name,
+               overwrite_name,
+               specialized_on_rhs_ ? "_ConstantRhs" : 0);
+  return name_;
+}
+
+
 void GenericBinaryOpStub::Generate(MacroAssembler* masm) {
   // r1 : x
   // r0 : y