[strong] Fix inlining issue

src/mips64/lithium-mips64.h

Index: src/mips64/lithium-mips64.h
diff --git a/src/mips64/lithium-mips64.h b/src/mips64/lithium-mips64.h
index 3805fb90a72c45cfa07dad6663ac595907bd3e43..adc2a4faa8a8ac146a2d975103634739284dba17 100644
--- a/src/mips64/lithium-mips64.h
+++ b/src/mips64/lithium-mips64.h
@@ -1526,6 +1526,10 @@ class LArithmeticT final : public LTemplateInstruction<1, 3, 0> {
   void CompileToNative(LCodeGen* generator) override;
   const char* Mnemonic() const override;
 
+  DECLARE_HYDROGEN_ACCESSOR(BinaryOperation)
+
+  LanguageMode language_mode() { return hydrogen()->language_mode(); }
+
  private:
   Token::Value op_;
 };