Fixed issue v8:1644 (bug in the chaining of fixup position)

src/arm/assembler-arm.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 674 matching lines @@
 
 void Assembler::bind(Label* L) {
   ASSERT(!L->is_bound());  // label can only be bound once
   bind_to(L, pc_offset());
 }
 
 
 void Assembler::next(Label* L) {
   ASSERT(L->is_linked());
   int link = target_at(L->pos());
-  if (link > 0) {
+  if (link == kEndOfChain) {
+    L->Unuse();
+  } else {
+    ASSERT(link >= 0);
     L->link_to(link);
-  } else {
-    ASSERT(link == kEndOfChain);
-    L->Unuse();
   }
 }
 
 
 static Instr EncodeMovwImmediate(uint32_t immediate) {
   ASSERT(immediate < 0x10000);
   return ((immediate & 0xf000) << 4) | (immediate & 0xfff);
 }
 
 
@@ skipping 1942 matching lines @@
 
   // Since a constant pool was just emitted, move the check offset forward by
   // the standard interval.
   next_buffer_check_ = pc_offset() + kCheckPoolInterval;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM