Initial switch to Chromium-style CHECK_* and DCHECK_* macros.

src/compiler/control-reducer.cc

Index: src/compiler/control-reducer.cc
diff --git a/src/compiler/control-reducer.cc b/src/compiler/control-reducer.cc
index b7dec3622fd357c15078b428a1268c7d1f6dde92..105bdfe2017115dc2c0a82cc62147b5ed146692d 100644
--- a/src/compiler/control-reducer.cc
+++ b/src/compiler/control-reducer.cc
@@ -296,7 +296,7 @@ class ControlReducerImpl {
     for (size_t j = 0; j < nodes.size(); j++) {
       Node* node = nodes[j];
       for (Node* const input : node->inputs()) {
-        CHECK_NE(NULL, input);
+        CHECK(input);
       }
       for (Node* const use : node->uses()) {
         CHECK(marked.IsReachableFromEnd(use));
@@ -319,7 +319,7 @@ class ControlReducerImpl {
 
     // Recurse on an input if necessary.
     for (Node* const input : node->inputs()) {
-      CHECK_NE(NULL, input);
+      DCHECK(input);
       if (Recurse(input)) return;
     }