Reapply optimization of DeoptimizeIf for ia32 broken in r13633.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 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 878 matching lines @@
   }
 
   ASSERT(info()->IsStub() || frame_is_built_);
   bool needs_lazy_deopt = info()->IsStub();
   if (cc == no_condition && frame_is_built_) {
     if (needs_lazy_deopt) {
       __ call(entry, RelocInfo::RUNTIME_ENTRY);
     } else {
       __ jmp(entry, RelocInfo::RUNTIME_ENTRY);
     }
+  } else if (!needs_lazy_deopt && frame_is_built_) {
+    // Optimization for ia32 only that skips the indirection through a
+    // jump table entry for conditional deopts if possible.
+    ASSERT(cc != no_condition);
+    __ j(cc, entry, RelocInfo::RUNTIME_ENTRY);
   } else {
     // We often have several deopts to the same entry, reuse the last
     // jump entry if this is the case.
     if (jump_table_.is_empty() ||
         jump_table_.last().address != entry ||
         jump_table_.last().needs_frame != !frame_is_built_ ||
         jump_table_.last().is_lazy_deopt != needs_lazy_deopt) {
       JumpTableEntry table_entry(entry, !frame_is_built_, needs_lazy_deopt);
       jump_table_.Add(table_entry, zone());
     }
@@ skipping 5305 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32