Extend SystemTap SDT probe argument parser

Extend SystemTap SDT probe argument parser

This patch extends the current generic parser for SystemTap SDT probe
arguments.  It can be almost considered a cleanup, but the main point of
it is actually to allow the generic parser to accept multiple prefixes
and suffixes for the its operands (i.e., integers, register names, and
register indirection).

I have chosen to implement this as a list of const strings, and declare
this list as "static" inside each target's method used to initialize
gdbarch.

This patch is actually a preparation for an upcoming patch for ARM,
which implements the support for multiple integer prefixes (as defined
by ARM's asm spec).  And AArch64 will also need this, for the same
reason.

This patch was regtested on all architectures that it touches (i.e.,
i386, x86_64, ARM, PPC/PPC64, s390x and IA-64).  No regressions were found.

2013-12-19  Sergio Durigan Junior  <sergiodj@redhat.com>

	* amd64-tdep.c (amd64_init_abi): Declare SystemTap SDT probe
	argument prefixes and suffixes.  Initialize gdbarch with them.
	* arm-linux-tdep.c (arm_linux_init_abi): Likewise.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbarch.sh (stap_integer_prefix, stap_integer_suffix)
	(stap_register_prefix, stap_register_suffix)
	(stap_register_indirection_prefix)
	(stap_register_indirection_suffix): Declare as "const char *const
	*" instead of "const char *".  Adjust printing function.  Rename
	all of the variables to the plural.
	(pstring_list): New function.
	* i386-tdep.c (i386_elf_init_abi): Declare SystemTap SDT probe
	argument prefixes and suffixes.  Initialize gdbarch with them.
	* ia64-linux-tdep.c (ia64_linux_init_abi): Likewise.
	* ppc-linux-tdep.c (ppc_linux_init_abi): Likewise.
	* s390-linux-tdep.c (s390_gdbarch_init): Likewise.
	* stap-probe.c (stap_is_generic_prefix): New function.
	(stap_is_register_prefix): Likewise.
	(stap_is_register_indirection_prefix): Likewise.
	(stap_is_integer_prefix): Likewise.
	(stap_generic_check_suffix): Likewise.
	(stap_check_integer_suffix): Likewise.
	(stap_check_register_suffix): Likewise.
	(stap_check_register_indirection_suffix): Likewise.
	(stap_parse_register_operand): Remove unecessary declarations for
	variables holding prefix and suffix information.  Use the new
	functions listed above for checking for prefixes and suffixes.
	(stap_parse_single_operand): Likewise.