Reland Implement .eh_frame writer and disassembler.

src/codegen.h

Index: src/codegen.h
diff --git a/src/codegen.h b/src/codegen.h
index 82962ad8026ab763f64ce95ff580e8d7de90467c..c49fd8825cabcb507772a64332dd4c4fa8e379d5 100644
--- a/src/codegen.h
+++ b/src/codegen.h
@@ -69,7 +69,7 @@ namespace internal {
 
 
 class CompilationInfo;
-
+class EhFrameWriter;
 
 class CodeGenerator {
  public:
@@ -78,6 +78,7 @@ class CodeGenerator {
 
   // Allocate and install the code.
   static Handle<Code> MakeCodeEpilogue(MacroAssembler* masm,
+                                       EhFrameWriter* unwinding,
                                        CompilationInfo* info);
 
   // Print the code after compiling it.