[SM6.10] LinAlg Validation: Validate Params and K Dim

[V-FEXrt]

Add the following validation rules:

• undef is disallowed as a LinAlg builtin parameter
• LinAlg types without metadata are disallowed as LinAlg builtin parameters and return types
• LinAlg type returned from a LinAlg builtin must have a valid K dimension

The vast majority of the change is updating tests that were previously out of spec as well as adding new tests that intentionally raise the new validation failures.

Some of the tests are fixed by using the fillmatrix builtin to have an actual matrix SSA value. This will be invalid in some cases but those invalid uses will be much easier to fix as they are found/disallowed by future validation PRs

[bob80905]

I think we should add a test that checks for the new diagnostic.

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[bob80905]

My other comment is a nit, it can be taken or left. Otherwise, LGTM

[hekota]

(read the next comment first please ;))

This is want I have in mind:

Suggested change

	ConstantInt *Ints[5];
	for (size_t I = 0; I < 5; ++I) {
	ConstantAsMetadata *ConstMDI =
	dyn_cast<ConstantAsMetadata>(MDT->getOperand(I + 1).get());
	if (!ConstMDI)
	return std::nullopt;
	ConstantInt *CI = dyn_cast<ConstantInt>(ConstMDI->getValue());
	if (!CI)
	return std::nullopt;
	Ints[I] = CI;
	}
	LinAlgTargetType LATT;
	LATT.Type = static_cast<DXIL::ComponentType>(Ints[0]->getLimitedValue());
	LATT.M = Ints[1]->getLimitedValue();
	LATT.N = Ints[2]->getLimitedValue();
	LATT.Use = static_cast<DXIL::MatrixUse>(Ints[3]->getLimitedValue());
	LATT.Scope = static_cast<DXIL::MatrixScope>(Ints[4]->getLimitedValue());
	return {{Ty, LATT}};
	uint64_t Ints[5];
	for (size_t I = 0; I < 5; ++I) {
	ConstantAsMetadata *ConstMDI =
	dyn_cast<ConstantAsMetadata>(MDT->getOperand(I + 1).get());
	if (!ConstMDI)
	return;
	ConstantInt *CI = dyn_cast<ConstantInt>(ConstMDI->getValue());
	if (!CI)
	return;
	Ints[I] = CI->getLimitedValue();
	}
	auto Result = Map.try_emplace(Ty, static_cast<DXIL::ComponentType>(Ints[0]),
	Ints[1], Ints[2], static_cast<DXIL::MatrixUse>(Ints[3]),
	static_cast<DXIL::MatrixScope>(Ints[4]));
	if (!Result.second)
	;// TODO: validation error - metadata for this type already exists

[V-FEXrt]

how strongly do you want the validation error for type already exists?

The map is built up during initialization/before we have access to a ValidationContext (in fact this function call is in the ValContext ctor). If we want to raise an error there, we'll need to do some rearchitecting somewhere.