Treat builtins separately in Yul AST

[clonker]

Depends on

• Yul: Remove boolType and defaultType from dialect #15332

[cameel]

Even with parts extracted into prerequisite PRs this is still a ton of code, but finally I managed to get through it all.

And it actually looks good. I didn't find any serious problems. Only a few minor things that would be good to clean up before we merge. Some of them, like CommonOptions::dialect() or YulName(string_view) or making Dialect a class, could also be done separately rather than directly in this PR.

[cameel]

Suggested change

	void InlinableExpressionFunctionFinder::checkAllowed(FunctionName _name)
	{
	// disallowed function names can only ever be user-defined `yul::Identifier`s, not builtins
	if (std::holds_alternative<Identifier>(_name) && m_disallowedIdentifiers.count(std::get<Identifier>(_name).name))
	void InlinableExpressionFunctionFinder::checkAllowed(FunctionName const& _name)
	{
	// disallowed function names can only ever be user-defined `yul::Identifier`s, not builtins
	if (std::holds_alternative<Identifier>(_name) && m_disallowedIdentifiers.count(std::get<Identifier>(_name).name) != 0)

[cameel]

There's also the spacing and const&. No need to make a copy of the whole AST node.

It sucks that github does not highlight all the differences in the snippet.

[clonker]

Ahhh yeah, passing it as cref now, missed that earlier.

[cameel]

Two more places where you could use the new YulString constructor.