[csa] add utilities for printf-style debugging

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index db16ab4dd73c78fa9255b2ab5ef561a3ff42fc05..226a4a212b5fa60513b9bcf06a4e84a333cae032 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -1167,6 +1167,13 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
                                        Node* deferred_on_resolve,
                                        Node* deferred_on_reject, Node* context);
 
+  // Support for printf-style debugging
+  void Print(const char* s);
+  void DebugPrint(const char* prefix, Node* tagged_value);

[Igor Sheludko, 2017/01/24 09:24:56]

How about calling all these functions just Print()? Otherwise the Print() looks
like it is semantically different than DebugPrint().

[caitp, 2017/01/24 13:16:04]

Sounds good

+  inline void DebugPrint(Node* tagged_value) {
+    return DebugPrint(nullptr, tagged_value);
+  }
+
  protected:
   void DescriptorLookupLinear(Node* unique_name, Node* descriptors, Node* nof,
                               Label* if_found, Variable* var_name_index,