New loplugin:unusedmember

* See comment at head of compilerplugins/clang/unusedmember.cxx for description.

* Moved isAllRelevantCodeDefined from loplugin:fakebool to PluginHandler for
reuse.  (Made it a member function so that it can reuse its two
RecordCompleteMap instances across different loplugins.  Probably safer
lifecycle-wise to have them as PluginHandler members than to have them as
static local variables in function isAllRelevantCodeDefined.)

* Need Plugin::ignoreLocation overload for TypeLoc now, thanks to
UnusedMember::VisitElaboratedTypeLoc.

* UETT_PreferredAlignOf was split off UETT_AlignOf with <https://github.com/
llvm/llvm-project/commit/6822bd79ac43f267613f1615bf60407103e24dba> "PR26547:
alignof should return ABI alignment, not preferred alignment".

* RecursiveASTVisitor::TraverseAlignedAttr traverses into the attribute's
argument only since <https://github.com/llvm/llvm-project/commit/
f26d551387f032e05e5e6551605b150f38c3f5b2> "Do not look through pack
expansions when looking for unexpanded parameter packs".

Change-Id: Ic2702b03d4567fa2533333766de7920f3c524a69
Reviewed-on: https://gerrit.libreoffice.org/84416
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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