x86: Fold arch_names_table into processor_alias_table

x86: Fold arch_names_table into processor_alias_table

In i386-builtins.c, arch_names_table is used to to map architecture name
string to internal model.  A switch statement is used to map internal
processor name to architecture name string and internal priority.

model and priority are added to processor_alias_table so that a single
entry contains architecture name string, internal processor name,
internal model and internal priority.  6 entries are appended for
i386-builtins.c, which have special architecture name strings: amd,
amdfam10h, amdfam15h, amdfam17h, shanghai and istanbul, and pta_size is
adjusted to exclude them.  Entries which are not used by i386-builtins.c
have internal model 0.  P_PROC_DYNAMIC is added to internal priority to
make entries with dynamic architecture name string or priority.

	PR target/95842
	* common/config/i386/i386-common.c (processor_alias_table): Add
	processor model and priority to each entry.
	(pta_size): Updated with -6.
	(num_arch_names): New.
	* common/config/i386/i386-cpuinfo.h: New file.
	* config/i386/i386-builtins.c (feature_priority): Removed.
	(processor_model): Likewise.
	(_arch_names_table): Likewise.
	(arch_names_table): Likewise.
	(_isa_names_table): Replace P_ZERO with P_NONE.
	(get_builtin_code_for_version): Replace P_ZERO with P_NONE.  Use
	processor_alias_table.
	(fold_builtin_cpu): Replace arch_names_table with
	processor_alias_table.
	* config/i386/i386.h: Include "common/config/i386/i386-cpuinfo.h".
	(pta): Add model and priority.
	(num_arch_names): New.