Print MachineTypes when using --trace-turbo-graph.

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 912f8a6dec8b77dc9cbc61e872dff041b54b2822..ad9587bc812f5d76ccaf2543afcf63c648c20360 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -136,6 +136,8 @@ bool operator!=(RelocatablePtrConstantInfo const& lhs,
                 RelocatablePtrConstantInfo const& rhs);
 std::ostream& operator<<(std::ostream&, RelocatablePtrConstantInfo const&);
 size_t hash_value(RelocatablePtrConstantInfo const& p);
+std::ostream& operator<<(std::ostream& os,
+                         const ZoneVector<MachineType>* types);
 
 // Interface for building common operators that can be used at any level of IR,
 // including JavaScript, mid-level, and low-level.