tidy: revisions inherit global directives

[folkertdev]

specifically needs-llvm-components

Based on this function, directives apply to a revision also when the directive is defined "globally".

rust/src/tools/compiletest/src/directives/line.rs

Lines 100 to 102 in 89a9993

	pub(crate) fn applies_to_test_revision(&self, test_revision: Option<&str>) -> bool {
	self.revision.is_none() || self.revision == test_revision
	}

But tidy did not take that into account.

I'm not sure how to test this.

r? jieyouxu