Revert of [turbofan] Add language mode to JSCallFunction operator.

src/compiler/js-operator.cc

Index: src/compiler/js-operator.cc
diff --git a/src/compiler/js-operator.cc b/src/compiler/js-operator.cc
index fa866186df043e3f606942434594b0eda5835e0d..91aa271e17c3897bee7986779e4cb559a5b65951 100644
--- a/src/compiler/js-operator.cc
+++ b/src/compiler/js-operator.cc
@@ -14,8 +14,25 @@
 namespace internal {
 namespace compiler {
 
+bool operator==(CallFunctionParameters const& lhs,
+                CallFunctionParameters const& rhs) {
+  return lhs.arity() == rhs.arity() && lhs.flags() == rhs.flags();
+}
+
+
+bool operator!=(CallFunctionParameters const& lhs,
+                CallFunctionParameters const& rhs) {
+  return !(lhs == rhs);
+}
+
+
+size_t hash_value(CallFunctionParameters const& p) {
+  return base::hash_combine(p.arity(), p.flags());
+}
+
+
 std::ostream& operator<<(std::ostream& os, CallFunctionParameters const& p) {
-  return os << p.arity() << ", " << p.flags() << ", " << p.language_mode();
+  return os << p.arity() << ", " << p.flags();
 }
 
 
@@ -337,9 +354,8 @@
 
 
 const Operator* JSOperatorBuilder::CallFunction(size_t arity,
-                                                CallFunctionFlags flags,
-                                                LanguageMode language_mode) {
-  CallFunctionParameters parameters(arity, flags, language_mode);
+                                                CallFunctionFlags flags) {
+  CallFunctionParameters parameters(arity, flags);
   return new (zone()) Operator1<CallFunctionParameters>(   // --
       IrOpcode::kJSCallFunction, Operator::kNoProperties,  // opcode
       "JSCallFunction",                                    // name