Rollup merge of #99298 - ChrisDenton:ignore-plugins-stage1, r=Mark-Simulacrum

Make `ui-fulldeps/gated-plugins` and `ui-fulldeps/multiple-plugins` tests stage 2 only

These test can fail on stage 1.

Fixes #99295

Author: GuillaumeGomez

src/test/ui-fulldeps/gated-plugin.rs

@@ -1,4 +1,5 @@
 // aux-build:empty-plugin.rs
+// ignore-stage1
 
 #![plugin(empty_plugin)]
 //~^ ERROR compiler plugins are deprecated

src/test/ui-fulldeps/gated-plugin.stderr

@@ -1,5 +1,5 @@
 error[E0658]: compiler plugins are deprecated
-  --> $DIR/gated-plugin.rs:3:1
+  --> $DIR/gated-plugin.rs:4:1
    |
 LL | #![plugin(empty_plugin)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^
@@ -8,7 +8,7 @@ LL | #![plugin(empty_plugin)]
    = help: add `#![feature(plugin)]` to the crate attributes to enable
 
 warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
-  --> $DIR/gated-plugin.rs:3:1
+  --> $DIR/gated-plugin.rs:4:1
    |
 LL | #![plugin(empty_plugin)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version

src/test/ui-fulldeps/multiple-plugins.rs

@@ -1,6 +1,7 @@
 // run-pass
 // aux-build:multiple-plugins-1.rs
 // aux-build:multiple-plugins-2.rs
+// ignore-stage1
 
 // Check that the plugin registrar of multiple plugins doesn't conflict
 

src/test/ui-fulldeps/multiple-plugins.stderr

@@ -1,13 +1,13 @@
 warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
-  --> $DIR/multiple-plugins.rs:8:1
+  --> $DIR/multiple-plugins.rs:9:1
    |
 LL | #![plugin(multiple_plugins_1)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
 warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
-  --> $DIR/multiple-plugins.rs:9:1
+  --> $DIR/multiple-plugins.rs:10:1
    |
 LL | #![plugin(multiple_plugins_2)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version