[Bug target/57112] -march=x86-64 not documented

[curlypaul924 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57112

Paul Brannan <curlypaul924 at gmail dot com> changed:

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--- Comment #3 from Paul Brannan <curlypaul924 at gmail dot com> ---
-march=x86-64 is in the man page for gcc 8.2 (it was not in the man page for
5.4; I'm not sure which version it first appears).