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

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 978d571fc639273b183b47d910e1ded2789bd040..e2b7b7989e0d0c9522839bd402711dd0e99be283 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -207,7 +207,7 @@ CompilationInfo::~CompilationInfo() {
   // Check that no dependent maps have been added or added dependent maps have
   // been rolled back or committed.
   for (int i = 0; i < DependentCode::kGroupCount; i++) {
-    DCHECK_EQ(NULL, dependencies_[i]);
+    DCHECK(!dependencies_[i]);
   }
 #endif  // DEBUG
 }