Update ui tests

Author: varkor

src/test/ui/consts/const-eval/const-eval-overflow-3b.stderr

@@ -1,11 +1,11 @@
 error[E0308]: mismatched types
-  --> $DIR/const-eval-overflow-3b.rs:24:22
+  --> $DIR/const-eval-overflow-3b.rs:18:22
    |
 LL |     = [0; (i8::MAX + 1u8) as usize];
    |                      ^^^ expected i8, found u8
 
 error[E0277]: cannot add `u8` to `i8`
-  --> $DIR/const-eval-overflow-3b.rs:24:20
+  --> $DIR/const-eval-overflow-3b.rs:18:20
    |
 LL |     = [0; (i8::MAX + 1u8) as usize];
    |                    ^ no implementation for `i8 + u8`

src/test/ui/rust-2018/extern-crate-idiomatic-in-2018.fixed

@@ -23,4 +23,3 @@ fn main() {
     // But this should be a use of the (renamed) crate:
     crate::bar::foo();
 }
-

src/test/ui/rust-2018/extern-crate-idiomatic.fixed

@@ -16,4 +16,3 @@ use edition_lint_paths::foo;
 fn main() {
     foo();
 }
-

src/test/ui/rust-2018/extern-crate-referenced-by-self-path.fixed

@@ -15,4 +15,3 @@ use self::edition_lint_paths::foo;
 fn main() {
     foo();
 }
-

src/test/ui/rust-2018/extern-crate-rename.fixed

@@ -16,4 +16,3 @@ use crate::my_crate::foo;
 fn main() {
     foo();
 }
-

src/test/ui/rust-2018/extern-crate-submod.fixed

@@ -23,4 +23,3 @@ use crate::m::edition_lint_paths::foo;
 fn main() {
     foo();
 }
-