Remove support for legacy const, part 1

src/compiler.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/compiler.h"
 
 #include <algorithm>
 
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 494 matching lines @@
     return AbortOptimization(kTooManyParameters);
   }
 
   if (info()->is_osr() &&
       LUnallocated::TooManyParametersOrStackSlots(scope->num_parameters(),
                                                   scope->num_stack_slots())) {
     // Crankshaft would require too many Lithium operands.
     return AbortOptimization(kTooManyParametersLocals);
   }
 
-  if (scope->HasIllegalRedeclaration()) {
-    // Crankshaft cannot handle illegal redeclarations.
-    return AbortOptimization(kFunctionWithIllegalRedeclaration);
-  }
-
   if (FLAG_trace_opt) {
     OFStream os(stdout);
     os << "[compiling method " << Brief(*info()->closure())
        << " using Crankshaft";
     if (info()->is_osr()) os << " OSR";
     os << "]" << std::endl;
   }
 
   if (FLAG_trace_hydrogen) {
     isolate()->GetHTracer()->TraceCompilation(info());
@@ skipping 1423 matching lines @@
     MaybeHandle<Code> code;
     if (cached.code != nullptr) code = handle(cached.code);
     Handle<Context> native_context(function->context()->native_context());
     SharedFunctionInfo::AddToOptimizedCodeMap(shared, native_context, code,
                                               literals, BailoutId::None());
   }
 }
 
 }  // namespace internal
 }  // namespace v8