Do not append input value of AS comparison if the check is eliminated. Fixes issue 4944, crash caus…

runtime/vm/intermediate_language_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/intermediate_language.h"
 
 #include "lib/error.h"
@@ skipping 70 matching lines @@
                                   locs());
     __ popl(temp);  // Remove argument.
     __ popl(result);  // Restore result.
   }
 #if defined(DEBUG)
   // TODO(srdjan): Fix for functions with finally clause.
   // A finally clause may leave a previously pushed return value if it
   // has its own return instruction. Method that have finally are currently
   // not optimized.
   if (!compiler->HasFinally()) {
+    __ Comment("Stack Check");
     Label done;
     __ movl(EDI, EBP);
     __ subl(EDI, ESP);
     // + 1 for Pc marker.
     __ cmpl(EDI, Immediate((compiler->StackSize() + 1) * kWordSize));
     __ j(EQUAL, &done, Assembler::kNearJump);
     __ int3();
     __ Bind(&done);
   }
 #endif
@@ skipping 2144 matching lines @@
     __ j(ABOVE_EQUAL, deopt);
   }
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64