Normalise diagnostics with respect to "the X is declared/defined here"

src/test/ui/allocator/two-allocators.stderr

@@ -2,7 +2,7 @@ error: cannot define multiple global allocators
   --> $DIR/two-allocators.rs:6:1
    |
 LL | static A: System = System;
-   | -------------------------- previous global allocator is defined here
+   | -------------------------- previous global allocator defined here
 LL | #[global_allocator]
 LL | static B: System = System;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot define a new global allocator

src/test/ui/borrowck/issue-45983.nll.stderr

@@ -2,7 +2,7 @@ error[E0521]: borrowed data escapes outside of closure
   --> $DIR/issue-45983.rs:20:18
    |
 LL |     let x = None;
-   |         - `x` is declared here, outside of the closure body
+   |         - `x` declared here, outside of the closure body
 LL |     give_any(|y| x = Some(y));
    |               -  ^^^^^^^^^^^ `y` escapes the closure body here
    |               |

src/test/ui/generator/ref-escapes-but-not-over-yield.stderr

@@ -2,7 +2,7 @@ error[E0521]: borrowed data escapes outside of generator
   --> $DIR/ref-escapes-but-not-over-yield.rs:11:9
    |
 LL |     let mut a = &3;
-   |         ----- `a` is declared here, outside of the generator body
+   |         ----- `a` declared here, outside of the generator body
 ...
 LL |         a = &b;
    |         ^^^^--

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-comparing-against-free.stderr

@@ -19,7 +19,7 @@ error[E0521]: borrowed data escapes outside of closure
 LL |     foo(cell, |cell_a, cell_x| {
    |                ------  ------ `cell_x` is a reference that is only valid in the closure body
    |                |
-   |                `cell_a` is declared here, outside of the closure body
+   |                `cell_a` declared here, outside of the closure body
 LL |         cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure
    |         ^^^^^^^^^^^^^^^^^^^^^^^^ `cell_x` escapes the closure body here
 

src/test/ui/nll/outlives-suggestion-simple.stderr

@@ -99,7 +99,7 @@ error[E0521]: borrowed data escapes outside of function
 LL |     fn get_bar(&self) -> Bar2 {
    |                -----
    |                |
-   |                `self` is declared here, outside of the function body
+   |                `self` declared here, outside of the function body
    |                `self` is a reference that is only valid in the function body
 LL |         Bar2::new(&self)
    |         ^^^^^^^^^^^^^^^^ `self` escapes the function body here