New processors core-avx and core-avx2 are added. It was done to have
possibilities to turn new features on for these processors. Please review.

2012-12-27  Vladimir Yakovlev  <vladimir.b.yakovlev@intel.com

        * config/i386/i386-c.c (ix86_target_macros_internal): New cases
added.
         (ix86_target_macros_internal): Likewise.

        * config/i386/i386.c (m_CORE2I7): Removed.
        (m_CORE_AVX): New macro.
        (m_CORE_AVX2): Likewise.
        (m_CORE_ALL): Likewise.
        (initial_ix86_tune_features): m_CORE2I7 is replaced by m_CORE_ALL.
        (initial_ix86_arch_features): Likewise.
        (processor_target_table): Initializations for Core avx  and Core
avx2 were added.
        (cpu_names): New names "coreavx" and "coreavx2" are added.
        (ix86_option_override_internal): Changed PROCESSOR_COREI7 by
PROCESSOR_CORE_AVX
        or PROCESSOR_CORE_AVX2.
        (ix86_issue_rate): New cases added.
        (ia32_multipass_dfa_lookahead): Likewise.
        (ix86_sched_init_global): Likewise.
        (get_builtin_code_for_version): Likewise.

        * config/i386/i386.h (TARGET_CORE_AVX): New macro.
        (TARGET_CORE_AVX2): Likewise.
        (target_cpu_default): New TARGET_CPU_DEFAULT_core_avx and
TARGET_CPU_DEFAULT_core_avx2.
        (processor_type): New PROCESSOR_CORE_AVX and PROCESSOR_CORE_AVX2.