[Issue 21276] New: TypeInfo.tsize() and TypeInfo.talign() should be replaced with member variables

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21276

          Issue ID: 21276
           Summary: TypeInfo.tsize() and TypeInfo.talign() should be
                    replaced with member variables
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: andrei at erdani.com

Currently TypeInfo.tsize() and TypeInfo.talign() are virtual functions that
simply return an integral each. Then there's the work on const-folding those:
https://github.com/dlang/dmd/pull/11792

The right and simpler approach is to make these two member variables in the
TypeInfo object. That should make everything easier, cheaper, and faster,
including the const folding.

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