GDBJIT: emit .eh_frame section on x64.

This enables proper stack unwinding on x64.

Currently this requires V8 to be compiled without snapshot and --gdbjit-full to be enabled.

Original patch by Sanjoy Das (http://codereview.chromium.org/6371011/)

Review URL: http://codereview.chromium.org/6250104

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6575 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

AUTHORS

@@ -32,6 +32,7 @@ Rafal Krypa <rafal@krypa.net>
 Rene Rebe <rene@exactcode.de>
 Rodolph Perfetta <rodolph.perfetta@arm.com>
 Ryan Dahl <coldredlemur@gmail.com>
+Sanjoy Das <sanjoy@playingwithpointers.com>
 Subrato K De <subratokde@codeaurora.org>
 Vlad Burlik <vladbph@gmail.com>
 Mike Gilbert <floppymaster@gmail.com>

src/gdb-jit.h

@@ -55,7 +55,8 @@ namespace internal {
   V(STUB)                                       \
   V(BUILTIN)                                    \
   V(SCRIPT)                                     \
-  V(EVAL)
+  V(EVAL)                                       \
+  V(FUNCTION)
 
 class GDBJITLineInfo : public Malloced {
  public:
@@ -109,6 +110,7 @@ class GDBJITInterface: public AllStatic {
 
   static void AddCode(const char* name,
                       Code* code,
+                      CodeTag tag,
                       Script* script = NULL);
 
   static void AddCode(Handle<String> name,