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

src/compiler/node.h

Index: src/compiler/node.h
diff --git a/src/compiler/node.h b/src/compiler/node.h
index 57a0ebb72e247e23a4c41b9375b3aff53b8eb7c1..a9edab8b6bb7f2713445069f88f54c17c5fc575b 100644
--- a/src/compiler/node.h
+++ b/src/compiler/node.h
@@ -282,7 +282,7 @@ class Edge FINAL {
   friend class Node::UseEdges::iterator;
   friend class Node::InputEdges::iterator;
 
-  explicit Edge(Node::Input* input) : input_(input) { DCHECK_NOT_NULL(input); }
+  explicit Edge(Node::Input* input) : input_(input) { DCHECK(input); }
 
   Node::Input* input_;
 };
@@ -401,7 +401,7 @@ class Node::UseEdges::iterator FINAL {
   }
   bool operator!=(const iterator& other) const { return !(*this == other); }
   iterator& operator++() {
-    DCHECK_NOT_NULL(current_);
+    DCHECK(current_);
     current_ = next_;
     next_ = current_ ? current_->next : nullptr;
     return *this;
@@ -451,7 +451,7 @@ class Node::Uses::const_iterator FINAL {
     return other.current_ != current_;
   }
   const_iterator& operator++() {
-    DCHECK_NOT_NULL(current_);
+    DCHECK(current_);
     current_ = current_->next;
     return *this;
   }