RecordLayout::UnadjustedAlignment was documented as "Maximum of the
alignments of the record members in characters", but
RecordLayout::getUnadjustedAlignment(), which just returns
UnadjustedAlignment, was documented as getting "the record alignment in
characters, before alignment adjustement." These are not the same thing:
the former excludes alignment of base classes, the latter takes it into
account. ItaniumRecordLayoutBuilder::LayoutBase was setting it according
to the former, but the AAPCS calling convention handling, currently the
only user, relies on it being set according to the latter.
Fixes#135551.
ca9ec7dfc3