Remove strong mode support from binary operations.

src/crankshaft/mips64/lithium-mips64.h

Index: src/crankshaft/mips64/lithium-mips64.h
diff --git a/src/crankshaft/mips64/lithium-mips64.h b/src/crankshaft/mips64/lithium-mips64.h
index 1513028c0e889af11e4cab83046be0051188fb41..30d4f332609b6b27250850a3a8d57b14cfb17544 100644
--- a/src/crankshaft/mips64/lithium-mips64.h
+++ b/src/crankshaft/mips64/lithium-mips64.h
@@ -1136,8 +1136,6 @@ class LCmpT final : public LTemplateInstruction<1, 3, 0> {
   DECLARE_CONCRETE_INSTRUCTION(CmpT, "cmp-t")
   DECLARE_HYDROGEN_ACCESSOR(CompareGeneric)
 
-  Strength strength() { return hydrogen()->strength(); }
-
   Token::Value op() const { return hydrogen()->token(); }
 };
 
@@ -1493,8 +1491,6 @@ class LArithmeticT final : public LTemplateInstruction<1, 3, 0> {
 
   DECLARE_HYDROGEN_ACCESSOR(BinaryOperation)
 
-  Strength strength() { return hydrogen()->strength(); }
-
  private:
   Token::Value op_;
 };