Add test to check that RegExp-ia32 can survive a garbage collection during execution.

src/regexp-macro-assembler-ia32.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1028 matching lines @@
         if (c1 != c2) {
           return 0;
         }
       }
     }
   }
   return 1;
 }
 
 
-int RegExpMacroAssemblerIA32::CheckStackGuardState(Address return_address,
+int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address,
                                                    Code* re_code) {
   if (StackGuard::IsStackOverflow()) {
     Top::StackOverflow();
     return 1;
   }
 
   // If not real stack overflow the stack guard was used to interrupt
   // execution for another purpose.
 
   // Prepare for possible GC.
   Handle<Code> code_handle(re_code);
 
-  ASSERT(re_code->instruction_start() <= return_address);
-  ASSERT(return_address <=
+  ASSERT(re_code->instruction_start() <= *return_address);
+  ASSERT(*return_address <=
       re_code->instruction_start() + re_code->instruction_size());
 
   Object* result = Execution::HandleStackGuardInterrupt();
 
   if (*code_handle != re_code) {  // Return address no longer valid
     int delta = *code_handle - re_code;
-    *reinterpret_cast<int32_t*>(return_address) += delta;
+    // Overwrite the return address on the stack.
+    *return_address += delta;
   }
 
   if (result->IsException()) {
     return 1;
   }
   return 0;
 }
 
 
 Address RegExpMacroAssemblerIA32::GrowStack(Address stack_pointer,
@@ skipping 171 matching lines @@
 
 
 void RegExpMacroAssemblerIA32::LoadConstantBufferAddress(Register reg,
                                                          ArraySlice* buffer) {
   __ mov(reg, buffer->array());
   __ add(Operand(reg), Immediate(buffer->base_offset()));
 }
 
 #undef __
 }}  // namespace v8::internal