Initial Grand Ridge support

Initial Grand Ridge support

gcc/ChangeLog:

	* common/config/i386/cpuinfo.h
	(get_intel_cpu): Handle Grand Ridge.
	* common/config/i386/i386-common.cc
	(processor_names): Add grandridge.
	(processor_alias_table): Ditto.
	* common/config/i386/i386-cpuinfo.h:
	(enum processor_types): Add INTEL_GRANDRIDGE.
	* config.gcc: Add -march=grandridge.
	* config/i386/driver-i386.cc (host_detect_local_cpu):
	Handle grandridge.
	* config/i386/i386-c.cc (ix86_target_macros_internal):
	Ditto.
	* config/i386/i386-options.cc (m_GRANDRIDGE): New define.
	(processor_cost_table): Add grandridge.
	* config/i386/i386.h (enum processor_type):
	Add PROCESSOR_GRANDRIDGE.
	(PTA_GRANDRIDGE): Ditto.
	* doc/extend.texi: Add grandridge.
	* doc/invoke.texi: Ditto.

gcc/testsuite/ChangeLog:

	* g++.target/i386/mv16.C: Add grandridge.
	* gcc.target/i386/funcspec-56.inc: Handle new march.