RISC-V: Add -mtune=thead-c906 to the invoke docs

gcc/ChangeLog

	* doc/invoke.texi (RISC-V): Document -mtune=thead-c906.
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Palmer Dabbelt 2022-05-25 19:30:55 -07:00
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@ -28164,7 +28164,7 @@ Permissible values for this option are: @samp{sifive-e20}, @samp{sifive-e21},
Optimize the output for the given processor, specified by microarchitecture or
particular CPU name. Permissible values for this option are: @samp{rocket},
@samp{sifive-3-series}, @samp{sifive-5-series}, @samp{sifive-7-series},
@samp{size}, and all valid options for @option{-mcpu=}.
@samp{thead-c906}, @samp{size}, and all valid options for @option{-mcpu=}.
When @option{-mtune=} is not specified, use the setting from @option{-mcpu},
the default is @samp{rocket} if both are not specified.