Use linux_get_siginfo_type_with_fields for x86

Use linux_get_siginfo_type_with_fields for x86

Use linux_get_siginfo_type_with_fields for adding bound fields on
segmentation fault for i386/amd64 siginfo.

2016-02-02  Walfred Tedeschi  <walfred.tedeschi@intel.com>

gdb/ChangeLog:

	* linux-tdep.h (linux_get_siginfo_type_with_fields): Make extern.
	* linux-tdep.c (linux_get_siginfo_type_with_fields): Make extern.
	* i386-linux-tdep.h (x86_linux_get_siginfo_type): New
	function.
	* amd64-linux-tdep.c (amd64_linux_init_abi_common): Add
	x86_linux_get_siginfo_type for the amd64 abi.
	* i386-linux-tdep.c (x86_linux_get_siginfo_type): New
	function.
	(i386_linux_init_abi): Add new function at the i386 ABI
	initialization.