[PATCH] Don't make -gsplit-dwarf imply -g

[Fangrui Song]

On 2020-05-13, Eric Botcazou wrote:
>> Did I mention I dislike -fsplit-dwarf? ;)
>
>Seconded, this will be confusing for almost all users.  Since the option only
>affects debug info generation, it should be prefixed with 'g' in any case.

Updating the semantics of -gsplit-dwarf is actually my favorite as
well:)

-gsplit-dwarf is not common. Many uses have separate -g. Let's change it.

Attached the patch.


(I also wish -gdwarf-5 did not imply -g but the ship may have shipped.)
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