Ensures that GDB prints stacktraces correctly for x64 builds when debugging t...

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
===================================================================
--- src/x64/codegen-x64.cc	(revision 6445)
+++ src/x64/codegen-x64.cc	(working copy)
@@ -2994,6 +2994,9 @@
   // receiver.
   frame_->Exit();
   masm_->ret((scope()->num_parameters() + 1) * kPointerSize);
+
+  SET_UNWIND_INFO(UNWIND_STATE_AFTER_RETURN, masm_->pc_offset());
+

[Vyacheslav Egorov (Chromium), 2011/01/25 12:50:11]

Revert this change.

Classic codegen is going to be replaced by Crankshaft in the future so we think
there is no need to support GDBJIT in classic codegen.

People should run with --always-full-compiler if they want --gdbjit (or even
--gdbjit will enable --always-full-compiler by default).

There is some support for line information in codegen.cc that I added but I
think I will just revert that.

   DeleteFrame();
 
 #ifdef ENABLE_DEBUGGER_SUPPORT