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

src/compiler/loop-peeling.cc

Index: src/compiler/loop-peeling.cc
diff --git a/src/compiler/loop-peeling.cc b/src/compiler/loop-peeling.cc
index 1bdf71a7d10641eb3b68ef5f982a054cfab64f02..39f487f85461e2dee18dc8a5b58f2d0eb7fd3ac1 100644
--- a/src/compiler/loop-peeling.cc
+++ b/src/compiler/loop-peeling.cc
@@ -268,7 +268,7 @@ PeeledIteration* LoopPeeler::Peel(Graph* graph, CommonOperatorBuilder* common,
         }
       }
       // There should be a merge or a return for each exit.
-      CHECK_NE(NULL, found);
+      CHECK(found);
     }
     // Return nodes, the end merge, and the phis associated with the end merge
     // must be duplicated as well.