Remove ASSERT since there are tons of different ASSIGN variants

src/x64/full-codegen-x64.cc

 // Copyright 2012 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_X64
 
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2408 matching lines @@
     __ movp(rdx, location);
     __ CompareRoot(rdx, Heap::kTheHoleValueRootIndex);
     __ j(not_equal, &assign, Label::kNear);
     __ Push(var->name());
     __ CallRuntime(Runtime::kThrowReferenceError, 1);
     __ bind(&assign);
     EmitStoreToStackLocalOrContextSlot(var, location);
 
   } else if (!var->is_const_mode() || op == Token::INIT_CONST) {
     if (var->IsLookupSlot()) {
-      ASSERT(op == Token::ASSIGN || op == Token::INIT_VAR ||
-             op == Token::ASSIGN_ADD);
       // Assignment to var.
       __ Push(rax);  // Value.
       __ Push(rsi);  // Context.
       __ Push(var->name());
       __ Push(Smi::FromInt(strict_mode()));
       __ CallRuntime(Runtime::kStoreLookupSlot, 4);
     } else {
       // Assignment to var or initializing assignment to let/const in harmony
       // mode.
       ASSERT(var->IsStackAllocated() || var->IsContextSlot());
@@ skipping 2367 matching lines @@
   ASSERT_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64