X87: [strong] Refactor ObjectStrength into a replacement for strong boolean args

src/x87/lithium-x87.h

Index: src/x87/lithium-x87.h
diff --git a/src/x87/lithium-x87.h b/src/x87/lithium-x87.h
index cc4620d99e6251ed8b024399a67003d019006118..2e95cab4ab2134bf25412dd3e02beaf3a58269c6 100644
--- a/src/x87/lithium-x87.h
+++ b/src/x87/lithium-x87.h
@@ -1182,7 +1182,7 @@ class LCmpT final : public LTemplateInstruction<1, 3, 0> {
   DECLARE_CONCRETE_INSTRUCTION(CmpT, "cmp-t")
   DECLARE_HYDROGEN_ACCESSOR(CompareGeneric)
 
-  LanguageMode language_mode() { return hydrogen()->language_mode(); }
+  Strength strength() { return hydrogen()->strength(); }
 
   LOperand* context() { return inputs_[0]; }
   Token::Value op() const { return hydrogen()->token(); }
@@ -1549,7 +1549,7 @@ class LArithmeticT final : public LTemplateInstruction<1, 3, 0> {
 
   DECLARE_HYDROGEN_ACCESSOR(BinaryOperation)
 
-  LanguageMode language_mode() { return hydrogen()->language_mode(); }
+  Strength strength() { return hydrogen()->strength(); }
 
  private:
   Token::Value op_;