3365558265
Extend BlaiseTypeInfo with an impllist field (NULL-terminated {ti,itab}
pairs) so the runtime can walk a class's interface set. Add
_ImplementsInterface and _GetItab to blaise_exc.c for the 'is IFoo'
and 'F := T as IFoo' operators respectively.
Compiler changes:
- uAST: ResolvedTargetType field on TIsExpr
- uSemantic: accept tyInterface on RHS of is/as; set ResolvedTargetType
- uCodeGenQBE: EmitIsExpr dispatches to _ImplementsInterface for interface
targets; EmitAssignment handles F := T as IFoo via _GetItab + branch
- EmitTypeInfoDefs: extend to 2-field layout {parent, impllist}
- EmitInterfaceDefs: emit per-class impllist data blocks
- uSymbolTable: register IInterface as built-in interface type
10 new tests in cp.test.interfaces; 2 existing typeinfo tests updated
for new 2-field format. 494 tests, 0 failures.
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