Rebase resume argument projections during state transform

When remapping a resume argument with projections rebase them on top of
the new base.

The case where resume argument has projections is unusual, but might
arise with box syntax where the assignment is performed directly into
the box without an intermediate temporary.

src/test/ui/generator/yield-in-box.rs

@@ -1,8 +1,10 @@
 // run-pass
-
 // Test that box-statements with yields in them work.
 
-#![feature(generators, box_syntax)]
+#![feature(generators, box_syntax, generator_trait)]
+use std::pin::Pin;
+use std::ops::Generator;
+use std::ops::GeneratorState;
 
 fn main() {
     let x = 0i32;
@@ -15,4 +17,8 @@ fn main() {
             _t => {}
         }
     };
+
+    let mut g = |_| box yield;
+    assert_eq!(Pin::new(&mut g).resume(1), GeneratorState::Yielded(()));
+    assert_eq!(Pin::new(&mut g).resume(2), GeneratorState::Complete(box 2));
 }

src/test/ui/generator/yield-in-box.stderr

@@ -1,5 +1,5 @@
 warning: unused generator that must be used
-  --> $DIR/yield-in-box.rs:9:5
+  --> $DIR/yield-in-box.rs:11:5
    |
 LL | /     || {
 LL | |         let y = 2u32;