also run some generator tests without MIR optimizations

Author: RalfJung

src/test/ui/generator/conditional-drop.rs

@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![feature(generators, generator_trait)]
 
 use std::ops::Generator;

src/test/ui/generator/control-flow.rs

@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![feature(generators, generator_trait)]
 
 use std::marker::Unpin;

src/test/ui/generator/drop-env.rs

@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![feature(generators, generator_trait)]
 
 use std::ops::Generator;

src/test/ui/generator/smoke-resume-args.rs

@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 #![feature(generators, generator_trait)]
 
 use std::fmt::Debug;

src/test/ui/generator/smoke.rs

@@ -1,5 +1,8 @@
 // run-pass
 
+// revisions: default nomiropt
+//[nomiropt]compile-flags: -Z mir-opt-level=0
+
 // ignore-emscripten no threads support
 // compile-flags: --test