Use ensure for analysis calls

Author: bjorn3

Diff for: compiler/rustc_driver_impl/src/lib.rs

@@ -449,7 +449,7 @@ fn run_compiler(
                     return early_exit();
                 }
 
-                let _ = tcx.analysis(());
+                tcx.ensure().analysis(());
 
                 if callbacks.after_analysis(compiler, tcx) == Compilation::Stop {
                     return early_exit();

Diff for: compiler/rustc_driver_impl/src/pretty.rs

@@ -223,7 +223,7 @@ impl<'tcx> PrintExtra<'tcx> {
 
 pub fn print<'tcx>(sess: &Session, ppm: PpMode, ex: PrintExtra<'tcx>) {
     if ppm.needs_analysis() {
-        let _ = ex.tcx().analysis(());
+        ex.tcx().ensure().analysis(());
     }
 
     let (src, src_name) = get_source(sess);