Rename test file to please tidy

Author: tesuji

tests/ui/mismatched_types/issue-127545-option-of-ref.rs renamed to tests/ui/mismatched_types/transforming-option-ref-issue-127545.rs

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-127545-option-of-ref.rs:5:5
+  --> $DIR/transforming-option-ref-issue-127545.rs:5:5
    |
 LL | pub fn foo(arg: Option<&Vec<i32>>) -> Option<&[i32]> {
    |                                       -------------- expected `Option<&[i32]>` because of return type
@@ -14,7 +14,7 @@ LL |     arg.map(|v| &**v)
    |        ++++++++++++++
 
 error[E0308]: mismatched types
-  --> $DIR/issue-127545-option-of-ref.rs:9:19
+  --> $DIR/transforming-option-ref-issue-127545.rs:9:19
    |
 LL |     arg.unwrap_or(&[])
    |         --------- ^^^ expected `&Vec<i32>`, found `&[_; 0]`
@@ -24,7 +24,7 @@ LL |     arg.unwrap_or(&[])
    = note: expected reference `&Vec<i32>`
               found reference `&[_; 0]`
 help: the return type of this call is `&[_; 0]` due to the type of the argument passed
-  --> $DIR/issue-127545-option-of-ref.rs:9:5
+  --> $DIR/transforming-option-ref-issue-127545.rs:9:5
    |
 LL |     arg.unwrap_or(&[])
    |     ^^^^^^^^^^^^^^---^
@@ -38,7 +38,7 @@ LL |     arg.map_or(&[], |v| v)
    |         ~~~~~~~~~~~~~~~~~~
 
 error[E0308]: mismatched types
-  --> $DIR/issue-127545-option-of-ref.rs:13:19
+  --> $DIR/transforming-option-ref-issue-127545.rs:13:19
    |
 LL |     arg.unwrap_or(v)
    |         --------- ^ expected `&Vec<i32>`, found `&[i32]`
@@ -48,7 +48,7 @@ LL |     arg.unwrap_or(v)
    = note: expected reference `&Vec<i32>`
               found reference `&'a [i32]`
 help: the return type of this call is `&'a [i32]` due to the type of the argument passed
-  --> $DIR/issue-127545-option-of-ref.rs:13:5
+  --> $DIR/transforming-option-ref-issue-127545.rs:13:5
    |
 LL |     arg.unwrap_or(v)
    |     ^^^^^^^^^^^^^^-^