'TFoo.X.Field := V' and 'TFoo.X.Method()' failed semantic analysis with
"Field access requires a record or class base, got 'class of TFoo'".
The read form (TFoo.X.Field as an expression) already worked.
When a qualified static var is the base of a further chain on an l-value,
the parser shapes it as a Base-form field access whose base is the bare
class-name ident resolving to the 'class of TFoo' metaclass, rather than
the simple RecordName form. AnalyseFieldAccess's chained-base path
rejected a metaclass base outright.
Semantic: in the chained-base path, when the base type is a metaclass,
resolve the field as a static var (IsClassVarRead) or static property
(IsStaticPropGet) of the metaclass's base class, mirroring the RecordName
static-member read path, so the result type feeds the outer chain.
QBE codegen: EmitInstancePtr loads the instance pointer from the static
var's global slot for an IsClassVarRead base, and the field-access reader
checks IsClassVarRead before the chained-base branch so a Base-form static
var is loaded directly rather than treated as a chained field of the
metaclass. The native backend already produced correct code.
Tests cover the read, a scalar field write, and a method call through the
chained static-var base on both backends.
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