* ia64-linux-tdep.c: Update GATE_AREA_END value to reflect reality.
* ia64-linux-tdep.c: Include gdbcore.h. (IA64_LINUX_SIGCONTEXT_OFFSET): Magic constant removed. (ia64_linux_sigcontext_register_addr): Find the address of the sigcontext area stored in the sigframe instead of using a magic offset constant.
match the location at which the kernel is placing the sigcontext struct.