Make 'generate-redirect-pages' option unstable

Author: GuillaumeGomez

src/librustdoc/lib.rs

@@ -348,7 +348,7 @@ fn opts() -> Vec<RustcOptGroup> {
                        "Directory to persist doctest executables into",
                        "PATH")
         }),
-        stable("generate-redirect-pages", |o| {
+        unstable("generate-redirect-pages", |o| {
             o.optflag("",
                       "generate-redirect-pages",
                       "Generate extra pages to support legacy URLs and tool links")

src/test/rustdoc/issue-19190.rs

@@ -1,4 +1,4 @@
-// compile-flags:--generate-redirect-pages
+// compile-flags:-Z unstable-options --generate-redirect-pages
 
 use std::ops::Deref;
 

src/test/rustdoc/structfields.rs

@@ -1,4 +1,4 @@
-// compile-flags:--generate-redirect-pages
+// compile-flags:-Z unstable-options --generate-redirect-pages
 
 // @has structfields/Foo.t.html
 // @has - struct.Foo.html