Fix compilation on x64 after r15466

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/18643002

Patch from Jochen Eisinger <jochen@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15469 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/gdb-jit.cc

@@ -1799,7 +1799,7 @@ static void CreateDWARFSections(CodeDescription* desc,
     obj->AddSection(new(zone) DebugLineSection(desc));
   }
 #if V8_TARGET_ARCH_X64
-  obj->AddSection(new(zone) UnwindInfoSection(desc), zone);
+  obj->AddSection(new(zone) UnwindInfoSection(desc));
 #endif
 }