Collect type feedback on result of Math.[round|ceil|floor]

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 0e70826df2297d003f28c3de27577394fd9b57a2..e6a06dbc08b5220b3230eed33de09cec662ac56b 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -733,6 +733,15 @@ void MacroAssembler::GetBuiltinEntry(Register target, Builtins::JavaScript id) {
 }
 
 
+void MacroAssembler::BranchIfNotBuiltin(Register function, Register temp,
+                                        BuiltinFunctionId id, Label* miss) {
+  movp(temp, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
+  movp(temp, FieldOperand(temp, SharedFunctionInfo::kFunctionDataOffset));
+  Cmp(temp, Smi::FromInt(id));
+  j(not_equal, miss);
+}
+
+
 #define REG(Name) { kRegister_ ## Name ## _Code }
 
 static const Register saved_regs[] = {