Remove duplicate aliases for codegen_{cranelift,gcc}

Bootstrap already allows selecting these in `PathSet::has`, which allows
any string that matches the end of a full path.

I found these by adding `assert!(path.exists())` in `StepDescription::paths`.
I think ideally we wouldn't have any aliases that aren't paths, but I've held
off on enforcing that here since it may be controversial, I'll open a separate PR.

src/bootstrap/check.rs

@@ -243,12 +243,7 @@ impl Step for CodegenBackend {
     const DEFAULT: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.paths(&[
-            "compiler/rustc_codegen_cranelift",
-            "rustc_codegen_cranelift",
-            "compiler/rustc_codegen_gcc",
-            "rustc_codegen_gcc",
-        ])
+        run.paths(&["compiler/rustc_codegen_cranelift", "compiler/rustc_codegen_gcc"])
     }
 
     fn make_run(run: RunConfig<'_>) {