[Issue 21149] templatized alias instances are not counted with -vtemplates

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21149

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
this is caused by special semantics function

- aliasInstanceSemantic()
- aliasSeqInstanceSemantic() (AliasSeq reports are wrong too)

I'm not sure if this is a bug because since there's a special processing for
them shouldn't be excluded of the report ?

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