Revert "Add fatal overflow test"

This reverts commit 9decfff6f8.

src/test/ui/typeck/hang-in-overflow.rs

@@ -1,19 +0,0 @@
-// normalize-stderr-test "the requirement `.*`" -> "the requirement `...`"
-// normalize-stderr-test "required for `.*` to implement `.*`" -> "required for `...` to implement `...`"
-// normalize-stderr-test: ".*the full type name has been written to.*\n" -> ""
-
-// Currently this fatally aborts instead of hanging.
-// Make sure at least that this doesn't turn into a hang.
-
-fn f() {
-    foo::<_>();
-    //~^ ERROR overflow evaluating the requirement
-}
-
-fn foo<B>()
-where
-    Vec<[[[B; 1]; 1]; 1]>: PartialEq<B>,
-{
-}
-
-fn main() {}

src/test/ui/typeck/hang-in-overflow.stderr

@@ -1,22 +0,0 @@
-error[E0275]: overflow evaluating the requirement `...`
-  --> $DIR/hang-in-overflow.rs:9:5
-   |
-LL |     foo::<_>();
-   |     ^^^^^^^^
-   |
-   = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`hang_in_overflow`)
-   = note: required for `...` to implement `...`
-   = note: 127 redundant requirements hidden
-   = note: required for `...` to implement `...`
-note: required by a bound in `foo`
-  --> $DIR/hang-in-overflow.rs:15:28
-   |
-LL | fn foo<B>()
-   |    --- required by a bound in this
-LL | where
-LL |     Vec<[[[B; 1]; 1]; 1]>: PartialEq<B>,
-   |                            ^^^^^^^^^^^^ required by this bound in `foo`
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0275`.