Fix generate-bytecode-expectations to work in component builds

src/ostreams.h

Index: src/ostreams.h
diff --git a/src/ostreams.h b/src/ostreams.h
index dea751413e9158da27fa1c25b21f7d3d4411ff78..e72c8eec3079c7479bc7966922dba11f51ee7ae1 100644
--- a/src/ostreams.h
+++ b/src/ostreams.h
@@ -80,7 +80,8 @@ struct AsHex {
 std::ostream& operator<<(std::ostream& os, const AsReversiblyEscapedUC16& c);
 
 // Same as AsReversiblyEscapedUC16 with additional escaping of \n, \r, " and '.
-std::ostream& operator<<(std::ostream& os, const AsEscapedUC16ForJSON& c);
+V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
+                                           const AsEscapedUC16ForJSON& c);
 
 // Writes the given character to the output escaping everything outside
 // of printable ASCII range.