Reimplement Maps and Sets in JS

src/arm/code-stubs-arm.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_ARM
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 987 matching lines @@
   {
     // Prevent literal pool emission before return address.
     Assembler::BlockConstPoolScope block_const_pool(masm);
     __ add(lr, pc, Operand(4));
     __ str(lr, MemOperand(sp, 0));
     __ Call(r5);
   }
 
   __ VFPEnsureFPSCRState(r2);
 
-  // Runtime functions should not return 'the hole'.  Allowing it to escape may
-  // lead to crashes in the IC code later.
-  if (FLAG_debug_code) {
-    Label okay;
-    __ CompareRoot(r0, Heap::kTheHoleValueRootIndex);
-    __ b(ne, &okay);
-    __ stop("The hole escaped");
-    __ bind(&okay);
-  }
-
   // Check result for exception sentinel.
   Label exception_returned;
   __ CompareRoot(r0, Heap::kExceptionRootIndex);
   __ b(eq, &exception_returned);
 
   // Check that there is no pending exception, otherwise we
   // should have returned the exception sentinel.
   if (FLAG_debug_code) {
     Label okay;
     ExternalReference pending_exception_address(
@@ skipping 4270 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM