[PATCH] x86: Add -march=cascadelake

[Wei Xiao]

Hi,

The attached patch added -march=cascadelake for x86.
Tested with bootstrap and regression tests on x86_64. No regressions.
Is it ok for trunk?

Wei

    gcc/
        * common/config/i386/i386-common.c (processor_names): Add cascadelake.
        (processor_alias_table): Add cascadelake.
        * config.gcc: Add -march=cascadelake.
        * config/i386/driver-i386.c
        (host_detect_local_cpu): Detect cascadelake.
        * config/i386/i386-c.c (ix86_target_macros_internal): Handle
cascadelake.
        * config/i386/i386.c (ix86_cost): Add m_CASCADELAKE.
        (processor_cost_table): Add cascadelake.
        (get_builtin_code_for_version): Handle cascadelake.
        (fold_builtin_cpu): Ditto.
        * config/i386/i386.h (TARGET_CASCADELAKE, PROCESSOR_CASCADELAKE): New.
        (PTA_CASCADELAKE): Ditto.
        * doc/invoke.texi: Add -march=cascadelake.
    gcc/testsuite/
        * g++.target/i386/mv16.C: Handle new march.
        * gcc.target/i386/funcspec-56.inc" Ditto.
    libgcc/
        * config/i386/cpuinfo.h: Add INTEL_COREI7_CASCADELAKE.

cascadelake.diff
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