Debugger: use debug break slot to break on call.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index c06c6c1fe498b1a9daf9314017a54d0dcf89f659..25acbf45a54214cf62f74ed408e3d826d5c79370 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -964,11 +964,6 @@ class CallICStub: public PlatformCodeStub {
     minor_key_ = state.GetExtraICState();
   }
 
-  static int ExtractArgcFromMinorKey(int minor_key) {
-    CallICState state(static_cast<ExtraICState>(minor_key));
-    return state.arg_count();
-  }
-
   Code::Kind GetCodeKind() const override { return Code::CALL_IC; }
 
   InlineCacheState GetICState() const override { return DEFAULT; }
@@ -1864,10 +1859,6 @@ class CallFunctionStub: public PlatformCodeStub {
     minor_key_ = ArgcBits::encode(argc) | FlagBits::encode(flags);
   }
 
-  static int ExtractArgcFromMinorKey(int minor_key) {
-    return ArgcBits::decode(minor_key);
-  }
-
  private:
   int argc() const { return ArgcBits::decode(minor_key_); }
   int flags() const { return FlagBits::decode(minor_key_); }