Simplify public pipeline interface.

src/compiler/pipeline.h

Index: src/compiler/pipeline.h
diff --git a/src/compiler/pipeline.h b/src/compiler/pipeline.h
index 4c1c0bcea9a20a278948484b63a007eb9a56e80f..9f8241a63c4ee4984f2f261f333a6447ce849c09 100644
--- a/src/compiler/pipeline.h
+++ b/src/compiler/pipeline.h
@@ -17,7 +17,6 @@ namespace internal {
 namespace compiler {
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
-class CallDescriptor;
 class Graph;
 class Schedule;
 class SourcePositionTable;
@@ -35,27 +34,19 @@ class Pipeline {
   Handle<Code> GenerateCodeForMachineGraph(Linkage* linkage, Graph* graph,
                                            Schedule* schedule = NULL);
 
-  CompilationInfo* info() const { return info_; }
-  Zone* zone() { return info_->zone(); }
-  Isolate* isolate() { return info_->isolate(); }
-
   static inline bool SupportedBackend() { return V8_TURBOFAN_BACKEND != 0; }
   static inline bool SupportedTarget() { return V8_TURBOFAN_TARGET != 0; }
 
-  static inline bool VerifyGraphs() {
-#ifdef DEBUG
-    return true;
-#else
-    return FLAG_turbo_verify;
-#endif
-  }
-
   static void SetUp();
   static void TearDown();
 
  private:
   CompilationInfo* info_;
 
+  CompilationInfo* info() const { return info_; }
+  Isolate* isolate() { return info_->isolate(); }
+  Zone* zone() { return info_->zone(); }
+
   Schedule* ComputeSchedule(Graph* graph);
   void VerifyAndPrintGraph(Graph* graph, const char* phase);
   Handle<Code> GenerateCode(Linkage* linkage, Graph* graph, Schedule* schedule,