Rollup merge of #142916 - aDotInTheVoid:you-can-trip-on-my-optimizer, r=GuillaumeGomez

rustdoc-json: Add test for `#[optimize(..)]`

Follow up to #138291

CC `@jdonszelmann`

r? `@GuillaumeGomez`

Author: GuillaumeGomez

tests/rustdoc-json/attrs/optimize.rs

@@ -0,0 +1,13 @@
+#![feature(optimize_attribute)]
+
+//@ is "$.index[?(@.name=='speed')].attrs" '["#[attr = Optimize(Speed)]"]'
+#[optimize(speed)]
+pub fn speed() {}
+
+//@ is "$.index[?(@.name=='size')].attrs" '["#[attr = Optimize(Size)]"]'
+#[optimize(size)]
+pub fn size() {}
+
+//@ is "$.index[?(@.name=='none')].attrs" '["#[attr = Optimize(DoNotOptimize)]"]'
+#[optimize(none)]
+pub fn none() {}