Rollup merge of #128922 - Nadrieril:r-a-use-upstream-pat-ana, r=Veykril

rust-analyzer: use in-tree `pattern_analysis` crate

r? ```@Veykril```

src/tools/rust-analyzer/crates/hir-ty/src/lib.rs

@@ -15,8 +15,10 @@ extern crate rustc_abi;
 #[cfg(not(feature = "in-rust-tree"))]
 extern crate ra_ap_rustc_abi as rustc_abi;
 
-// Use the crates.io version unconditionally until the API settles enough that we can switch to
-// using the in-tree one.
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_pattern_analysis;
+
+#[cfg(not(feature = "in-rust-tree"))]
 extern crate ra_ap_rustc_pattern_analysis as rustc_pattern_analysis;
 
 mod builder;