X64: enable stack sampling in profiler.

src/x64/codegen-x64.h

Index: src/x64/codegen-x64.h
diff --git a/src/x64/codegen-x64.h b/src/x64/codegen-x64.h
index 9e69007f3137f61a71515dea5cbb28694a1199d1..5014f71d3b2b872f6754254cdb975c329bfc4f9d 100644
--- a/src/x64/codegen-x64.h
+++ b/src/x64/codegen-x64.h
@@ -534,6 +534,8 @@ class CodeGenerator: public AstVisitor {
 
   void GenerateLog(ZoneList<Expression*>* args);
 
+  void GenerateGetFramePointer(ZoneList<Expression*>* args);
+
   // Fast support for Math.random().
   void GenerateRandomPositiveSmi(ZoneList<Expression*>* args);
 
@@ -593,6 +595,8 @@ class CodeGenerator: public AstVisitor {
   friend class Reference;
   friend class Result;
 
+  friend class CodeGeneratorPatcher;  // Used in test-log-stack-tracer.cc
+
   DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
 };