Revert "Make GCC happy again." and "Initial switch to Chromium-style CHECK_* and DCHECK_* macros.".

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index 34a3151009f78887fff4b086c7e1cbeced996b3a..ce2c076615cc612c87328950497de2f7cf81c591 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -447,7 +447,7 @@ InstructionBlocks* InstructionSequence::InstructionBlocksFor(
   size_t rpo_number = 0;
   for (BasicBlockVector::const_iterator it = schedule->rpo_order()->begin();
        it != schedule->rpo_order()->end(); ++it, ++rpo_number) {
-    DCHECK(!(*blocks)[rpo_number]);
+    DCHECK_EQ(NULL, (*blocks)[rpo_number]);
     DCHECK((*it)->GetRpoNumber().ToSize() == rpo_number);
     (*blocks)[rpo_number] = InstructionBlockFor(zone, *it);
   }