Add test for for loop maybe initializing binding

Author: estebank

src/test/ui/borrowck/borrowck-for-loop-uninitialized-binding.rs

@@ -0,0 +1,7 @@
+fn f() -> isize {
+    let mut x: isize;
+    for _ in 0..0 { x = 10; }
+    return x; //~ ERROR E0381
+}
+
+fn main() { f(); }

src/test/ui/borrowck/borrowck-for-loop-uninitialized-binding.stderr

@@ -0,0 +1,13 @@
+error[E0381]: used binding `x` is possibly-uninitialized
+  --> $DIR/borrowck-for-loop-uninitialized-binding.rs:4:12
+   |
+LL |     let mut x: isize;
+   |         ----- binding declared here but left uninitialized
+LL |     for _ in 0..0 { x = 10; }
+   |              ---- if the `for` loop runs 0 times, `x` is not initialized 
+LL |     return x;
+   |            ^ `x` used here but it is possibly-uninitialized
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0381`.