Remove --experimental-classes flag and related dead code.

src/arm64/full-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 442 matching lines @@
       int no_frame_start = masm_->pc_offset();
       __ ldp(fp, lr, MemOperand(current_sp, 2 * kXRegSize, PostIndex));
       // Drop the arguments and receiver and return.
       // TODO(all): This implementation is overkill as it supports 2**31+1
       // arguments, consider how to improve it without creating a security
       // hole.
       __ ldr_pcrel(ip0, (3 * kInstructionSize) >> kLoadLiteralScaleLog2);
       __ add(current_sp, current_sp, ip0);
       __ ret();
       int32_t arg_count = info_->scope()->num_parameters() + 1;
-      if (FLAG_experimental_classes &&
-          IsSubclassConstructor(info_->function()->kind())) {
+      if (IsSubclassConstructor(info_->function()->kind())) {
         arg_count++;
       }
       __ dc64(kXRegSize * arg_count);
       info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
     }
   }
 }
 
 
 void FullCodeGenerator::EffectContext::Plug(Variable* var) const {
@@ skipping 2396 matching lines @@
         PreservePositionScope scope(masm()->positions_recorder());
         VisitForStackValue(property->obj());
       }
       if (is_named_call) {
         EmitCallWithLoadIC(expr);
       } else {
         EmitKeyedCallWithLoadIC(expr, property->key());
       }
     }
   } else if (call_type == Call::SUPER_CALL) {
-    if (FLAG_experimental_classes) {
-      EmitSuperConstructorCall(expr);
-    } else {
-      SuperReference* super_ref = callee->AsSuperReference();
-      EmitLoadSuperConstructor();
-      __ Push(result_register());
-      VisitForStackValue(super_ref->this_var());
-      EmitCall(expr, CallICState::METHOD);
-    }
+    EmitSuperConstructorCall(expr);
   } else {
     DCHECK(call_type == Call::OTHER_CALL);
     // Call to an arbitrary expression not handled specially above.
     { PreservePositionScope scope(masm()->positions_recorder());
       VisitForStackValue(callee);
     }
     __ LoadRoot(x1, Heap::kUndefinedValueRootIndex);
     __ Push(x1);
     // Emit function call.
     EmitCall(expr);
@@ skipping 2570 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64