d: Change in DotTemplateExp type semantics leading to regression (PR101619)

d: Change in DotTemplateExp type semantics leading to regression (PR101619)

By giving dot templates a type, meant that properry resolving silently
started passing for code that should never have passed.  The simple fix
is to provide implementations for checkType and checkValue that give an
error about dot templates having neither a value nor type.

Reviewed-on: https://github.com/dlang/dmd/pull/12920

	PR d/101619

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 1d8386a63.