Update existing tests and .stderr files to reflect introduction of thread-local mem category.

Author: pnkfelix

src/test/ui/borrowck/borrowck-thread-local-static-borrow-outlives-fn.ast.stderr

@@ -2,9 +2,9 @@ error[E0597]: borrowed value does not live long enough
   --> $DIR/borrowck-thread-local-static-borrow-outlives-fn.rs:21:21
    |
 LL |      assert_static(&FOO); //[ast]~ ERROR [E0597]
-   |                     ^^^ - temporary value only lives until here
+   |                     ^^^ - borrowed value only lives until here
    |                     |
-   |                     temporary value does not live long enough
+   |                     borrowed value does not live long enough
    |
    = note: borrowed value must be valid for the static lifetime...
 

src/test/ui/issues/issue-17954.rs

@@ -23,4 +23,4 @@ fn main() {
         println!("{}", a);
     });
 }
-//~^ NOTE temporary value only lives until here
+//~^ NOTE borrowed value only lives until here

src/test/ui/issues/issue-17954.stderr

@@ -2,10 +2,10 @@ error[E0597]: borrowed value does not live long enough
   --> $DIR/issue-17954.rs:17:14
    |
 LL |     let a = &FOO;
-   |              ^^^ temporary value does not live long enough
+   |              ^^^ borrowed value does not live long enough
 ...
 LL | }
-   | - temporary value only lives until here
+   | - borrowed value only lives until here
    |
    = note: borrowed value must be valid for the static lifetime...