Add rocketlake to gcc.

gcc/
	* common/config/i386/cpuinfo.h (get_intel_cpu): Handle
	rocketlake.
	* common/config/i386/i386-common.c (processor_names): Add
	rocketlake.
	(processor_alias_table): Add rocketlake.
	* common/config/i386/i386-cpuinfo.h (processor_subtypes): Add
	INTEL_COREI7_ROCKETLAKE.
	* config.gcc: Add -march=rocketlake.
	* config/i386/i386-c.c (ix86_target_macros_internal): Handle
	rocketlake.
	* config/i386/i386-options.c (m_ROCKETLAKE)  : Define.
	(processor_cost_table): Add rocketlake cost.
	* config/i386/i386.h (ix86_size_cost) : Define
	TARGET_ROCKETLAKE.
	(processor_type) : Add PROCESSOR_ROCKETLAKE.
	(PTA_ROCKETLAKE): Ditto.
	* doc/extend.texi: Add rocketlake.
	* doc/invoke.texi: Add rocketlake.

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