ix86_split_lea_for_addr transforms a single LEA instruction into a
series of MOV and ADD instructions.  For

lea 0x400(%edx, %ecx, 8), %edx

we get

mov %ecx, %edx
add %ecx, %edx
add %ecx, %edx
add %ecx, %edx
add %ecx, %edx
add %ecx, %edx
add %ecx, %edx
add %ecx, %edx
add $0x400, %edx

For -mtune=intel, we want to turn on X86_TUNE_OPT_AGU, but avoid
ix86_split_lea_for_addr to optimize for both Haswell and Silvermont.
This patch adds X86_TUNE_AVOID_LEA_FOR_ADDR and PROCESSOR_INTEL.
We keep PROCESSOR_INTEL the same as PROCESSOR_SILVERMONT, except that
X86_TUNE_AVOID_LEA_FOR_ADDR isn't turned on for PROCESSOR_INTEL.

	* config/i386/i386-c.c (ix86_target_macros_internal): Handle
	PROCESSOR_INTEL.  Treat like PROCESSOR_GENERIC.
	* config/i386/i386.c (intel_memcpy): New.  Duplicate slm_memcpy.
	(intel_memset): New.  Duplicate slm_memset.
	(intel_cost): New.  Duplicate slm_cost.
	(m_INTEL): New macro.
	(processor_target_table): Add "intel".
	(ix86_option_override_internal): Replace PROCESSOR_SILVERMONT
	with PROCESSOR_INTEL for "intel".
	(ix86_lea_outperforms): Support PROCESSOR_INTEL.  Duplicate
	PROCESSOR_SILVERMONT.
	(ix86_avoid_lea_for_addr): Check TARGET_AVOID_LEA_FOR_ADDR
	instead of TARGET_OPT_AGU.
	(ix86_issue_rate): Likewise.
	(ix86_adjust_cost): Likewise.
	(ia32_multipass_dfa_lookahead): Likewise.
	(swap_top_of_ready_list): Likewise.
	(ix86_sched_reorder): Likewise.
	* config/i386/i386.h (TARGET_INTEL): New.
	(TARGET_AVOID_LEA_FOR_ADDR): Likewise.
	(processor_type): Add PROCESSOR_INTEL.
	* config/i386/x86-tune.def: Support m_INTEL. Duplicate
	m_SILVERMONT.  Add X86_TUNE_AVOID_LEA_FOR_ADDR.

From-SVN: r206717