[x86_64]: Zhaoxin lujiazui enablement

[x86_64]: Zhaoxin lujiazui enablement

This patch fix Zhaoxin CPU vendor ID detection problem and add zhaoxin
"lujiazui" processor support.  Currently gcc can't recognize Zhaoxin CPU
(vendor ID "CentaurHauls" and "Shanghai") if user use -march=native option,
which is confusing for users.  This patch enables -march=native in zhaoxin
family 7th processor and -march/-mtune=lujiazui, costs and tunning are set
according to the characteristics of the processor.
We add a new md file to describe lujiazui pipeline.

Testing:
Bootstrap is ok, and no regressions for i386/x86-64 testsuite.

Background:
Related Zhaoxin linux kernel patch can be found at:
https://lore.kernel.org/lkml/01042674b2f741b2aed1f797359bdffb@zhaoxin.com/

Related Zhaoxin glibc patch can be found at:
https://sourceware.org/git/?p=glibc.git;a=commit;h=32ac0b988466785d6e3cc1dffc364bb26fc63193

gcc/ChangeLog:

	* common/config/i386/cpuinfo.h (get_zhaoxin_cpu): Detect
	the specific type of Zhaoxin CPU, and return Zhaoxin CPU name.
	(cpu_indicator_init): Handle Zhaoxin processors.
	* common/config/i386/i386-common.cc: Add lujiazui.
	* common/config/i386/i386-cpuinfo.h (enum processor_vendor): Add
	VENDOR_ZHAOXIN.
	(enum processor_types): Add ZHAOXIN_FAM7H.
	(enum processor_subtypes): Add ZHAOXIN_FAM7H_LUJIAZUI.
	* config.gcc: Add lujiazui.
	* config/i386/cpuid.h (signature_SHANGHAI_ebx): Add
	Signatures for zhaoxin
	(signature_SHANGHAI_ecx): Ditto.
	(signature_SHANGHAI_edx): Ditto.
	* config/i386/driver-i386.cc (host_detect_local_cpu): Let
	-march=native recognize lujiazui processors.
	* config/i386/i386-c.cc (ix86_target_macros_internal): Add lujiazui.
	* config/i386/i386-options.cc (m_LUJIAZUI): New_definition.
	* config/i386/i386.h (enum processor_type): Ditto.
	* config/i386/i386.md: Add lujiazui.
	* config/i386/x86-tune-costs.h (struct processor_costs): Add
	lujiazui costs.
	* config/i386/x86-tune-sched.cc (ix86_issue_rate): Add lujiazui.
	(ix86_adjust_cost): Ditto.
	* config/i386/x86-tune.def (X86_TUNE_SCHEDULE): Add lujiazui Tunnings.
	(X86_TUNE_PARTIAL_REG_DEPENDENCY): Ditto.
	(X86_TUNE_SSE_PARTIAL_REG_DEPENDENCY): Ditto.
	(X86_TUNE_SSE_PARTIAL_REG_FP_CONVERTS_DEPENDENCY): Ditto.
	(X86_TUNE_SSE_PARTIAL_REG_CONVERTS_DEPENDENCY): Ditto.
	(X86_TUNE_MOVX): Ditto.
	(X86_TUNE_MEMORY_MISMATCH_STALL): Ditto.
	(X86_TUNE_FUSE_CMP_AND_BRANCH_32): Ditto.
	(X86_TUNE_FUSE_CMP_AND_BRANCH_64): Ditto.
	(X86_TUNE_FUSE_CMP_AND_BRANCH_SOFLAGS): Ditto.
	(X86_TUNE_FUSE_ALU_AND_BRANCH): Ditto.
	(X86_TUNE_ACCUMULATE_OUTGOING_ARGS): Ditto.
	(X86_TUNE_USE_LEAVE): Ditto.
	(X86_TUNE_PUSH_MEMORY): Ditto.
	(X86_TUNE_LCP_STALL): Ditto.
	(X86_TUNE_USE_INCDEC): Ditto.
	(X86_TUNE_INTEGER_DFMODE_MOVES): Ditto.
	(X86_TUNE_OPT_AGU): Ditto.
	(X86_TUNE_PREFER_KNOWN_REP_MOVSB_STOSB): Ditto.
	(X86_TUNE_MISALIGNED_MOVE_STRING_PRO_EPILOGUES): Ditto.
	(X86_TUNE_USE_SAHF): Ditto.
	(X86_TUNE_USE_BT): Ditto.
	(X86_TUNE_AVOID_FALSE_DEP_FOR_BMI): Ditto.
	(X86_TUNE_ONE_IF_CONV_INSN): Ditto.
	(X86_TUNE_AVOID_MFENCE): Ditto.
	(X86_TUNE_EXPAND_ABS): Ditto.
	(X86_TUNE_USE_SIMODE_FIOP): Ditto.
	(X86_TUNE_USE_FFREEP): Ditto.
	(X86_TUNE_EXT_80387_CONSTANTS): Ditto.
	(X86_TUNE_SSE_UNALIGNED_LOAD_OPTIMAL): Ditto.
	(X86_TUNE_SSE_UNALIGNED_STORE_OPTIMAL): Ditto.
	(X86_TUNE_SSE_TYPELESS_STORES): Ditto.
	(X86_TUNE_SSE_LOAD0_BY_PXOR): Ditto.
	* doc/extend.texi: Add details about lujiazui.
	* doc/invoke.texi: Add details about lujiazui.
	* config/i386/lujiazui.md: Introduce lujiazui cpu and include new md file.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/funcspec-56.inc: Test -arch=lujiauzi and -tune=lujiazui.
	* g++.target/i386/mv32.C: Ditto.

Signed-off-by: mayshao <mayshao-oc@zhaoxin.com>