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

src/mips/assembler-mips.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 762 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());
-  ASSERT(link > 0 || link == kEndOfChain);
   if (link == kEndOfChain) {
     L->Unuse();
-  } else if (link > 0) {
+  } else {
+    ASSERT(link >= 0);
     L->link_to(link);
   }
 }
 
 bool Assembler::is_near(Label* L) {
   if (L->is_bound()) {
     return ((pc_offset() - L->pos()) < kMaxBranchOffset - 4 * kInstrSize);
   }
   return false;
 }
@@ skipping 1262 matching lines @@
   *p = LUI | rt_code | ((itarget & kHiMask) >> kLuiShift);
   *(p+1) = ORI | rt_code | (rt_code << 5) | (itarget & kImm16Mask);
 
   CPU::FlushICache(pc, 2 * sizeof(int32_t));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS