Clearer later use messages for calls

Give a special message when the later use is from a call. Use the span
of the callee instead of the whole expression. For conflicting borrow
messages say that the later use is of the first borrow.

src/test/ui/issues/issue-11192.nll.stderr

@@ -8,10 +8,9 @@ LL |         ptr = box Foo { x: ptr.x + 1 };
    |         --- first borrow occurs due to use of `ptr` in closure
 ...
 LL |     test(&*ptr);
-   |     -----^^^^^-
-   |     |    |
-   |     |    immutable borrow occurs here
-   |     borrow later used here
+   |     ---- ^^^^^ immutable borrow occurs here
+   |     |
+   |     mutable borrow later used by call
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-18566.nll.stderr

@@ -2,11 +2,10 @@ error[E0499]: cannot borrow `*s` as mutable more than once at a time
   --> $DIR/issue-18566.rs:33:19
    |
 LL |     MyPtr(s).poke(s);
-   |     --------------^-
-   |     |     |       |
-   |     |     |       second mutable borrow occurs here
-   |     |     first mutable borrow occurs here
-   |     borrow later used here
+   |           -  ---- ^ second mutable borrow occurs here
+   |           |  |
+   |           |  first borrow later used by call
+   |           first mutable borrow occurs here
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-18783.nll.stderr

@@ -11,7 +11,7 @@ LL |     c.push(Box::new(|| y = 0));
    |                     second mutable borrow occurs here
 LL | //~^ ERROR cannot borrow `y` as mutable more than once at a time
 LL | }
-   | - borrow later used here, when `c` is dropped
+   | - first borrow later used here, when `c` is dropped
 
 error[E0499]: cannot borrow `y` as mutable more than once at a time
   --> $DIR/issue-18783.rs:26:29
@@ -26,7 +26,7 @@ LL |     Push::push(&c, Box::new(|| y = 0));
    |                             second mutable borrow occurs here
 LL | //~^ ERROR cannot borrow `y` as mutable more than once at a time
 LL | }
-   | - borrow later used here, when `c` is dropped
+   | - first borrow later used here, when `c` is dropped
 
 error: aborting due to 2 previous errors
 

src/test/ui/issues/issue-25793.nll.stderr

@@ -7,10 +7,9 @@ LL |         $this.width.unwrap()
 LL |         let r = &mut *self;
    |                 ---------- borrow of `*self` occurs here
 LL |         r.get_size(width!(self))
-   |         ------------------------
-   |         |          |
-   |         |          in this macro invocation
-   |         borrow later used here
+   |           -------- ------------ in this macro invocation
+   |           |
+   |           borrow later used by call
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-42106.nll.stderr

@@ -6,7 +6,7 @@ LL |     let _a = &collection;
 LL |     collection.swap(1, 2); //~ ERROR also borrowed as immutable
    |     ^^^^^^^^^^ mutable borrow occurs here
 LL |     _a.use_ref();
-   |     -- borrow later used here
+   |     -- immutable borrow later used here
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-45157.stderr

@@ -8,7 +8,7 @@ LL |         let nref = &u.z.c;
    |                    ^^^^^^ immutable borrow occurs here
 LL |         //~^ ERROR cannot borrow `u.z.c` as immutable because it is also borrowed as mutable [E0502]
 LL |         println!("{} {}", mref, nref)
-   |                           ---- borrow later used here
+   |                           ---- mutable borrow later used here
 
 error: aborting due to previous error